Meaning of EQUIVALENCE in English
/i kwiv"euh leuhns/ or, for 3, /ee'kweuh vay"leuhns/ , n.
1. the state or fact of being equivalent; equality in value, force, significance, etc.
2. an instance of this; an equivalent.
3. Chem. the quality of having equal valence.
4. Logic , Math.
a. Also called material implication . the relation between two propositions such that the second is not false when the first is true.
b. Also called material equivalence . the relation between two propositions such that they are either both true or both false.
c. the relation between two propositions such that each logically implies the other.
5. (of a logical or mathematical relationship) reflexive, symmetrical, and transitive.
Also, equivalency (for defs. 1, 2).
[ 1535-45; aequivalentia, equiv. to L aequivalent- EQUIVALENT + -ia -IA; see -ENCE ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012