Definition of: equivalent

(i·kwiv′ə·lənt) adjective
1. Equal in value, force, meaning, or the like.
2. Equal in area or volume.
3. Chem. Having the same valence or the same combining weight. See synonyms under ALIKE, IDENTICAL, SYNONYMOUS.
—noun
1. That which is equivalent; something equal in value, power, or effect.
2. Chem. a A number or amount representing one of the relative weights in which elements unite with each other to form compounds, or replace other elements in compounds. b The·combining weight of an element, compound, or radical, or that weight which combines with or displaces 8 parts of oxygen or 1.008 parts of hydrogen. [<LL aequivalens, -entis ppr. of aequivalere <aequus equal + valere be worth]
—e·quiv′·a·lent·ly adverb