noun
proposer; person who makes a proposal
Formal term for someone who formally puts forward a suggestion or plan, often in official or organizational contexts.
会議で彼が建議者として新しい方針を提案した。
At the meeting, he proposed a new policy as the proposer.
Compound of 建議 (proposal, suggestion) + 者 (person). The exact historical derivation is uncertain, but the kanji are conventionally associated with the meaning.