Noah Webster's New International Dictionary of the English Language

1. (v. i.) To make a return in words or writing; to respond; to answer.

2. (v. i.) To answer a defendant's plea.

3. (v. i.) Figuratively, to do something in return for something done; as, to reply to a signal; to reply to the fire of a battery.

4. (v. t.) To return for an answer.

5. (v. i.) That which is said, written, or done in answer to what is said, written, or done by another; an answer; a response.