Equivalence

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

Equal power or force; equivalent amount.

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.

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

To be equivalent or equal to; to counterbalance.

qualities that are comparable; "no comparison between the two books"; "beyond compare"

essential equality and interchangeability

a state of being essentially equal or equivalent; equally balanced; "on a par with the best"