noun, noun or participle which takes 'suru'
clear answer; definite answer
Used for a firm, unambiguous reply, often in formal or decisive contexts. Can be used as a noun or with する to mean 'to give a definite answer'.
彼はその質問に決答を避けた。
He avoided giving a definite answer to that question.
社長はその提案に決
The president did not give a clear answer to the proposal.