-anus

• -ēnus, -iānus, -īnus, -ūnus

From some -ā- stem + -nus; later interpreted as one whole suffix and used freely.

• (Classical) IPA^(key): /ˈaː.nus/, [ˈäːnʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈa.nus/, [ˈäːnus]

-ānus (feminine -āna, neuter -ānum); first/second-declension suffix

1. Of or pertaining to; -ian; usually indicates a relationship of position, possession, or origin.

The suffix -ānus is typically added to a noun stem (particularly proper nouns) to form an adjective.

Examples:

mōns (“mountain”) → montānus (“montane, of the mountains”)

Christus (“Christ”) → christiānus (“christian”)

Many such words, however, can be either nouns or adjectives.

Examples:

pāgus (“village”) → pāgānus (“rustic, of a village”), or a villager

Rōma (“Rome”) → rōmānus (“Roman”), or a person from Rome

-ānus is also often used to form personal names, particularly cognomina, from other names, denoting a patronymic or another relationship of belonging: Domitius → Domitiānus.

It is frequently preceded by the noun stem followed by -i- except in the case of Latin nouns (typically borrowed from Greek) ending -e- or -ae-, where it is preceded by -e- instead.

First/second-declension adjective.

• -ēnsis, -icus, -ācus