What is the meaning of -wa?

post-vocalic form of -a

marks third person singular proximate in verbs

Post-back vowel allomorphic form of -jə (an evidential suffix marking verifiable action)

Used to mark nouns as singular and definite, thereby making it equivalent to English the.

Forms passive verbs.

Forms passive verbs.

Forms passive verbs.

Rōmaji transcription of わ

Passive suffix

alternative form of -a (feminine, plural, or singulative ending), used with stems ending in -u, -w

forms feminine nouns

passive suffix

Forms passive verbs.

Forms passive verbs.

Forms passive verbs.

Source: wiktionary.org