n. - The condition of being equivalent or equal; equality of worth, value, signification, or force; as, an equivalence of definitions.
n. - Equal power or force; equivalent amount.
n. - The quantity of the combining power of an atom, expressed in hydrogen units; the number of hydrogen atoms can combine with, or be exchanged for; valency. See Valence.
n. - The degree of combining power as determined by relative weight. See Equivalent, n., 2.
v. t. - To be equivalent or equal to; to counterbalance.