Equivalence

Part of speech: noun (n.)

1. The condition of being equivalent or equal; equality of worth, value, signification, or force; as, an equivalence of definitions.

2. Equal power or force; equivalent amount.

3. 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.

4. The degree of combining power as determined by relative weight. See Equivalent, n., 2. [R.]

Part of speech: verb (v.)

To be equivalent or equal to; to counterbalance. [R.] Sir T. Browne.