1. a dilute solution of acetic acid that is used as a solvent (e.g. for a drug) • Derivationally related forms: acetify • Hypernyms: acetic acid, ethanoic acid 2. sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative • Syn: vinegar • Derivationally related forms: acetify • Hypernyms: condiment • Hyponyms: chili vinegar, cider vinegar, wine vinegar