Roots

The oldest system of declension was to affix the endings^{[lower-greek 11]} directly to the nominal root. This was an ancient feature already in decline in later Proto-Indo-European. Of the daughter languages, this system has been best preserved by Sanskrit, especially the older form of Indo-Aryan termed Vedic Sanskrit.^[7]

Stems

In Proto-Indo-European, a new system developed wherein an intermediary called the thematic vowel is inserted to the root before the final endings are appended: *-o- which in Sanskrit becomes -a-, producing the thematic stem.

Declension of a thematic stem is less complicated owing to the fact that a host of Sandhi rules apply no more, and the later stages of the Sanskrit language see an increase in the profusion of thematic nouns. Thus in classical Sanskrit, the thematic pā́da-s is more likely to be found than its athematic predecessor. ^[8][9]

${\displaystyle \underbrace {\underbrace {\mathrm {root+suffix} } _{\mathrm {stem} }+\mathrm {ending} } _{\mathrm {word} }}$

Cases

Sanskrit nouns are declined for eight cases:

• nominative: marks the subject of a verb.
• accusative: used for the direct object of a transitive verb.
• instrumental: marks the means by which the subject achieves or accomplishes an action, physically or abstractly.
• dative: used to indicate the indirect object of a transitive verb.
• ablative: used to express motion away from something.
• genitive: marks a noun as modifying another noun.
• locative: corresponds vaguely to the English prepositions in, on, at, and by.
• vocative: used for a word that identifies an addressee.^[10]

Endings

The basic scheme of suffixion^{[lower-greek 12]} is given in the table below and applies to many nouns and adjectives.

However, according to the gender and the final consonant or vowel of the uninflected word-stem, there are internal sandhi rules dictating the form of the inflected word. Furthermore, these are standalone forms, which when used in actual phrases are subject to external sandhi, such as, the mutation of -s to -ḥ or -r and so on.^[15][16]

Classification

Substantives may be divided into different classes on the basis of the stem vowel before they are declined on the above basis. The general classification is:

• Short-vowel stems
  • a-stems
  • i- and u-stems
  • ṛ-stems
• Long-vowel stems
  • ā-stems
  • ī- and ū-stems
• Diphthong stems
• Consonant stems
  • Bare stems
  • as/is/us-stems
  • an- and in-stems
  • ant-/mant-/vant-stems
  • vāṅs-stems

When the nominal endings are being affixed to a noun of each class, they may undergo, in some cases, some changes, including being entirely replaced by other forms. This happens most profusely in the a-stem class. However, for reasons noted below, grammars both traditional and modern tend to start with this class.^[17][18][19]

a-stems

The vast majority of nouns in Sanskrit belong to this class, and are masculine or neuter. The position of the accent is maintained throughout, except in the masculine vocative singular. The paradigms are illustrated in their pre-sandhi forms, along with the formation treatment using two stems in the masculine devá- ^{[upper-alpha 1][lower-alpha 9]} and kā́ma- ^{[upper-alpha 2]} and two in the neuter yugá- ^{[upper-alpha 3][lower-alpha 1]} and phála- ^{[upper-alpha 4]} with different syllables accented.^{[20][21][22][23]}

a-stem adjectives are also to be found in big numbers, they are invariably masculine or neuter – feminines being formed either in -ā or, less frequently -ī. a-stem adjectives are also declined as below.^[24]

Neuters only differ from the masculine in the nominative and accusative forms, the two forms always being the same:

i- and u-stems

ṛ-stems

ṛ-stems are predominantly agental derivatives like dātṛ ^{[upper-alpha 13]}, though also include kinship terms like pitṛ ^{[upper-alpha 14][lower-alpha 1]}, mātṛ ^{[upper-alpha 15][lower-alpha 1]}, and svasṛ ^{[upper-alpha 16][lower-alpha 1]}.^[31] The neuter equivalents of derivative agental nouns once again form secondary stems in -n, as in the -i and -u classes.

A single irregular i-stem noun,^[32] sakhi ^{[upper-alpha 18][lower-alpha 17]}, has a stem in -i but declines similarly to the above – simply with y i ī taking the place of r ṛ ṝ:

ā, ī- and ū-stems

This category is made of ā-, ī- and ū-stems, almost entirely feminine, polysyllabic derivative nouns.^[33]

Diphthong stems

Stems ending in Sanskrit diphthongs (e, ai, o, au) follow a fairly regular pattern, whilst subject to sandhi rules as usual.^[39][40]

Bare-consonant and as/us/is-stem nouns

Consonant stem nouns may have up to 3 different stems, as well as two special forms:

1. A special lengthened form for the masculine/feminine nominative singular
2. A special lengthened and/or nasalized form for the neuter nom/acc. plural
3. A strong stem^{[lower-greek 15]} used for masc./fem. sing. acc., dual nom./acc. and plur. nom.
4. A medium stem ^{[lower-greek 16]} used with oblique cases with consonant endings, as well as the neuter nom./acc. sing.
5. A weak stem ^{[lower-greek 17]} used everywhere else.

One or more of these stems may be identical for some words, but this is generally not regularly predictable from either the nominative singular or the citation form stem. While the stem ending may undergo expected internal sandhi changes as normal, the endings themselves are gracefully regular.^[41][42]

an-stem nouns and in-stem adjectives

an-stem nouns and in-stem adjectives (occurring prolifically in masc. and neu.) show very similar behavior and can be grouped together:^[43]

ant-, mant- and vant-stem adjectives

Participial forms in -ant/-at decline as below, with some stem variation with the -n-.^[44]. Possessives in -mant and vant- display similar behavior, the difference that stands out is the nom. sing. masc. -mān & -vān.^[45] Forms not mentioned fit the existing pattern with full regularity:

vāṅs-stem perfect participles

These forms exhibit similarities with the -vant stems illustrated above, with the main exception that in the weakest forms, before vowel endings, -vāṅs is zero-graded alongside the disappearance of the -ṅ-.^[46][47]

Comparatives and superlatives

Cardinal numbers

The numbers^[48][49] from one to ten, along with cognates in closely related languages, are:

All numbers in Sanskrit can be declined in all the cases. From one to four, the cardinal numerals agree with the substantive they qualify in number, gender and case; from 5 to 19, in number and case, with only one form for all genders; from 20 onwards in case only.^[50]

Éka is declined like a pronominal adjective, though the dual form does not occur. Dvá appears only in the dual. Trí and catúr are declined as below:^[51]

The numbers from 11 to 19 are:

ékādaśam, dvā́daśam, tráyodaśam, cáturdaśam, páñcadaśam, ṣóḍaśam, saptádaśam, aṣṭā́daśam, návadaśam.

The tens from 20 to 90 are:

(d)viṃśatí, triṃśát, catvāriṃśát, pañcāśát, ṣaṣṭí, saptatí, aśītí, navatí.

The joint numbers:

21 – ékaviṃśati, 22 – dvā́viṃśati, 23 – trayóviṃśati, ..., 26 – ṣáḍviṃśati, ..., but 82 – dvā́śīti, 83 – trayā́śīti, 88 – aṣṭā́śīti.

The hundreds are:

śatam, dvai śatai, trīṇi śatāni / tri śatam, etc.

The larger numbers:

Compounding numbers

All the numerals may be compounded attributively in their stem form:^[53]

Ordinal numbers

The ordinal numbers from one to ten are:

1. prathamás, -ā́
2. dvitī́yas, -ā
3. tṛtī́yas, -ā
4. caturthás, -ī́
5. pañcamás, -ī́
6. ṣaṣṭhás, -ī
7. saptamás, -ī́
8. aṣṭamás, -ī́
9. navamás, -ī́
10. daśamás, -ī́

Other numbers:

11. – ekādaśás, ... 20. – viṃśatitamás (viṃśás), 30. – triṃśattamás (triṃśás), 40. – catvāriṃśattamás, 50. – pañcāśattamás, 60. – ṣaṣtitamás, 70. – saptatitamás, 80. – aśītitamás, 90. – navatitamás, 100. – śatatamás, 1000. – sahasratamás.

First- and second-person pronouns

Sanskrit pronouns in the first^{[lower-greek 23]} and second^{[lower-greek 24]} person are theoretically termed asmad and yuṣmad respectively.

They resemble one another in how they are declined, and similarly do not mark gender. These pronouns have shortened, enclitic forms in the accusative, dative, and genitive cases (parenthesized in the table below).^[58][59]

The forms mad, asmad, tvad and yuṣmad can be used in derivation and composition: mát·kṛta, mát·sakhi, tvát·pitṛ, etc.^[60]

Demonstratives

Sanskrit does not have true third person pronouns, but its demonstratives play this role when they stand independently of a substantive. The four different demonstratives in Sanskrit^{[lower-alpha 26]} are:

• tad, adas
• idam, etad

Both tad and adas are used for objects of reference that are far away, the latter being more emphatic. Both are translated by the English distal demonstrative that.

By contrast, idam and etad are used for nearby objects, and, again, the latter is more emphatic and has a strong deictic meaning. These two pronouns are translated by the English proximal demonstrative this.^[61]

The masculine singular nominative form of tad, sas exhibits irregular sandhi behaviour — before consonants saḥ becomes sa, giving, for instance, sa gajaḥ ^{[upper-alpha 46]} rather than the expected *so gajaḥ.^{[62][lower-alpha 27]}

etad, is declined almost identically to tad. Its paradigm is obtained by prefixing e- to all the forms of tat. Consequently ^{[lower-alpha 28]} the masculine and feminine nominative singular forms of this pronoun are eṣas and eṣā.^[65]

The declension of idam is somewhat irregular because it is formed from two different stems, i- and a-.^{[lower-alpha 29]} The nominative and accusative forms, except the three singular nominatives, are regularly formed with the stem im-, and the remaining forms from a-; an extra -n- is infixed should the ending start with a vowel.

Most of the forms for adas are regularly formed using the stem u- the same way as if it were a-, with the combination *ui- becoming ī- in the plural. The nominative dual and instrumental singular are formed like u-stem nouns.^[67][68][69]

Possessive pronouns

asmad allows the following forms of possessive pronouns:

• madīya-, māmaka-, māmakīna-
• asmadīya-, asmāka-, asmākīna-

The feminines are in -ā.

yuṣmad has these:

• tvadīya-, tāvaka-, tāvakīna-
• yuṣmadīya-, yauṣmāka-, yauṣmākīṇa-

tad and etad have tadīya- and etadīya- respectively.

The feminines are again in -ā, except the -aka forms where it is -akī. These are all conjugated like regular a-, ā and ī-stem forms.^[70][71]

Polite pronoun

Technically a noun, bhavant ^{[lower-alpha 30]} literally means 'Your Honour' and is treated like a third-person subject. It carries, however, a second person meaning and connotes politeness. This is declined very much like any vant-stem adjective.

This use of bhavant is common enough to suggest that the word should be treated as a polite variant of the second person pronoun, rather than as a more elaborate honorific construction. Bhavant declines like all stems ending in -ant.

In talking of someone not present, one may use tatrabhavant, and conversely for someone present, atrabhavant, whether being addressed or not.^[72]

Enclitic pronouns

The enclitic pronoun enam is found only in a few oblique cases and numbers. It is unemphatic and mostly refers to persons.^[73]

The k-y-t series of interrogative, relative, and correlative pronouns

In Sanskrit, interrogative and relative pronouns are formed analogously to tat. The interrogative pronoun kim is declined like tat, replacing the initial t or s with k. The only exception to this rule is the neuter nominative/accusative singular form, which is kim rather than the expected *kat. The relative pronoun yat is declined like tat, without exception replacing the initial t or s with y.^[74]

The demonstrative tat functions as a correlative pronoun when used in "independent clauses that 'complete' relative clauses to form complex sentences"—unlike in English (where one can say, for example, "The girl with whom you were speaking is my sister"), relative pronouns must be accompanied by correlative pronouns (which, if applied to the previous example, would be: "The girl with whom you are speaking, she is my sister").^[75]

For a Sanskrit example of a complex sentence using corresponding relative and correlative pronouns, consider: yasmin vane vasati rāmas tasmin vane na vidyante rākṣasāḥ ('In the forest where Rāma lives, there are no demons'). In that example, the pronouns are alike in gender, number, and case, but matching relative–correlative pronouns need not be alike in case—for example: yena puruṣeṇa saha bhāṣate nṛpaḥ sa muniḥ ('The man with whom the king is speaking is a sage').^[76]

Reflexive pronouns

There are a number of words in Sanskrit that function as reflexive pronouns. The indeclinable svayam can indicate reflexivity pertaining to subjects of any person or number, and—since subjects in Sanskrit can appear in the nominative, instrumental, or genitive cases—it can have the sense of any of these cases. The noun ātman ('self') and adjective svaḥ ('own'; cf. Latin suus) decline so as to express reflexivity in any case, person, and number. The former is always in the masculine, even when used in relation to a female subject, but the latter declines for gender.^[79]

Pronominal adjectives

Several adjectives in Sanskrit are declined pronominally. That is, their declension differs from ordinary adjectival declension of a-stems and instead follows the declension of tat in certain respects.

• anya ('other'), anyatara ('either'), itara ('other'), katara ('which of two?'), katama ('which of many?'), and ekatama ('one of many') all follow the tat paradigm exactly.
• sarva ('every', 'all'), ubhaya ('both'), eka ('one'), and ekatara ('either') follow the tat paradigm except in the neuter nominative/accusative singular, ending in -m rather than -t.
• pūrva ('prior', 'east'), avara ('posterior', 'west'), adhara ('inferior', 'west'), uttara ('subsequent', 'north'), dakṣiṇa ('south'), para ('subsequent', 'other', 'opposite'), apara ('other', 'inferior'), antara ('outer'), and sva ('own') follow the tat paradigm except (1) in the neuter nominative/accusative singular, ending in -am rather than -at; (2) in the masculine/neuter ablative and locative singular, sometimes (though not necessarily) ending in -āt and -e rather than -asmāt and -asmin; and (3) in the masculine nominative plural, sometimes (though not necessarily) ending in -āḥ rather than -e.
• ardha ('half'), alpa ('little'), katipaya ('some'), prathama ('first'), carama ('last'), and dvaya/dvitaya ('twofold') generally follow the regular adjective declension for a-stems but sometimes (though not necessarily) follow tat in the masculine nominative plural, ending in -e rather than -āḥ.
• dvitīya ('second') and tṛtīya ('third') optionally follow the declension of tat in the forms of the oblique cases in the singular.

Note that when any of these adjectives are at the end of a compound, they decline exactly like ordinary a-stem adjectives.^[80]

Primary derivatives

The root usually undergoes some change of form first, typically to first-grade, or in some cases second-grade, strengthening. A final -n or -m may sometimes be lost, a short vowel may be first followed by a -t, a final palatal or h may revert to the corresponding guttural, and so on.^[83][84]

Secondary derivatives

This is used primarily to form words of adjectival meaning, and with the first vowel usually undergoing vṛddhi-grade strengthening.^[90]

Compounds