Noah Webster's New International Dictionary of the English Language

1. (n.) A sound reflected from an opposing surface and repeated to the ear of a listener; repercussion of sound; repetition of a sound.

2. (n.) Fig.: Sympathetic recognition; response; answer.

3. (n.) A wood or mountain nymph, regarded as repeating, and causing the reverberation of them.

4. (n.) A nymph, the daughter of Air and Earth, who, for love of Narcissus, pined away until nothing was left of her but her voice.

5. (v. t.) To send back (a sound); to repeat in sound; to reverberate.

6. (v. t.) To repeat with assent; to respond; to adopt.

7. (v. i.) To give an echo; to resound; to be sounded back; as, the hall echoed with acclamations.