equivalence

1. The condition of being equivalent or essentially equal: the status of being interchangeable. (uncountable) · His answer and yours share equivalence.· Cow's milk and soy milk have a lot of differences, but their equivalence is sufficient for this recipe.
2. An act of equating two things; an assertion of equivalence. (countable) · I disagree with his equivalence of his behavior with that of an overexcited teenager.
3. The relationship between two propositions that are either both true or both false. (uncountable)
4. An equivalence relation; ≡; ~. (countable)
5. A Boolean operation that is TRUE when both input variables are TRUE or both input variables are FALSE, but otherwise FALSE; the XNOR function. (countable, uncountable)
6. 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. (countable, uncountable)
7. 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. (countable, uncountable)
8. The state of two notes being separated by one octave or the similarity of two such notes. (countable, uncountable)

Plural equivalences