A reply to a question in a lesson or an examination or test or (outside a learning environment) in a quiz, etc.; a solution to a verbal puzzle or…

A particular instance or method of solving or settling; an explanation, answer, or decision.

An answer, an explanation. Obsolete.

The solution of a scholastic problem.

The solution of a problem.

A solution, explanation (of a difficulty), an answer (to an objection). Obsolete.

A clearing up or revelation of what is obscure or unknown; an explanation.

Originally U.S. A measure undertaken to resolve a problem; a solution, a remedy. Cf. quick-fix, n.