Etymology
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equivalence (n.)

"equality in value, correspondence in signification, force, nature, etc.," 1540s, from French équivalence, from Medieval Latin aequivalentia, from Late Latin aequivalentem "equivalent" (see equivalent). Related: Equivalency (1530s).

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Definitions of equivalence

equivalence (n.)
a state of being essentially equal or equivalent; equally balanced;
Synonyms: equality / equation / par
equivalence (n.)
essential equality and interchangeability;
equivalence (n.)
qualities that are comparable;
Synonyms: comparison / compare / comparability
From wordnet.princeton.edu