Illustrated Glossary of Organic Chemistry

Acetate: (1) An ester of acetic acid. Sometimes abbreviated as ROAc or AcOR.

General acetate ester structure.
Ethyl acetate, a common nonpolar aprotic solvent.

(2) The conjugate base of acetic acid; acetate ion. Sometimes abbreviated as AcO- or -OAc.

Deprotonation of acetic acid with a base such as hydroxide ion forms acetate ion.