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(uncountable) The condition of being equivalent or essentially equal.
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(countable, mathematics) An equivalence relation; ≡; ~
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(uncountable, logic) The relationship between two propositions that are either both true or both false.
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(chemistry) 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.
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(mathematics) A Boolean operation that is TRUE when both input variables are TRUE or both input variables are FALSE, but otherwise FALSE; the XNOR function.
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(geometry) A number in intersection theory. A positive-dimensional variety sometimes behaves formally as if it were a finite number of points; this number is its equivalence.
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(translation studies) The degree to which a term or text in one language is semantically similar to its translated counterpart.