सम्-

• सं- (san-) — before consonants

Borrowed from Sanskrit सम्- (sam-), from Proto-Indo-Aryan *sam-, from Proto-Indo-Iranian *sam-, ultimately from Proto-Indo-European *som- (“together, wholly”).

• (Delhi Hindi) IPA^(key): /səm/, [sɐ̃m]

सम्- • (sam-)

1. with, together with, con-, co-
2. intensifier; fully, wholly

   ‎सम्- (sam-) + ‎पूर्ण (pūrṇ, “full”) → ‎संपूर्ण (sampūrṇ, “complete”)

Before consonants, सं- (san-, sam-) is preferred. Before -म्- (-m-), either सं- (sam-) or सम्- (sam-) can be used.

• सम (sam)
• सह- (sah-)
• स- (sa-)

• McGregor, Ronald Stuart (1993) “सम्-”, in The Oxford Hindi-English Dictionary, London: Oxford University Press

• सं- (saṃ-)

Inherited from Proto-Indo-Aryan *sam-, from Proto-Indo-Iranian *sam-, ultimately from Proto-Indo-European *som- (“together, wholly”). Compare Middle Persian hm (ham), Persian هم (ham) and Ancient Greek σύν (sún, “with, in company with, together with”) (whence English syn-). Compare also English same, some.

• (Vedic) IPA^(key): /sɐm/
• (Classical) IPA^(key): /s̪ɐm/

सम्- • (sam-)

1. with, together with, along with, together, altogether

• Monier Williams (1899) “सम्-”, in A Sanskrit–English Dictionary, […], new edition, Oxford: At the Clarendon Press, →OCLC, page 1152/1.
• Mayrhofer, Manfred (1996) Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan]‎ (in German), volume 2, Heidelberg: Carl Winter Universitätsverlag, pages 702-3