We found one dictionary that defines the word proamendment:

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1. proamendment: Wiktionary

Definitions from Wiktionary (proamendment) ▸ adjective:  In favour of an amendment. ▸ Words similar to proamendment ▸ Usage examples for proamendment ▸ Idioms related to proamendment ▸ Wikipedia articles (New!) ▸ Popular nouns described by proamendment ▸ Words that often appear near proamendment ▸ Rhymes of proamendment ▸ Invented words related to proamendment