WordNet sense 1 (a statement (either spoken or written) that is made in reply to a question or request or criticism or accusation):

reply, response

WordNet sense 2 (a statement that solves a problem or explains how to solve the problem):

resolution, result, solution, solvent

WordNet sense 3 (be sufficient; be adequate, either in quality or quantity):

do, serve, suffice, do

WordNet sense 4 (reply or respond to):

respond

WordNet sense 5 (understand the meaning of):

resolve, resolve