| 释义 |
equiv·a·lence
\ə̇ˈkwiv(ə)lən(t)s, ēˈ-\ noun
also equiv·a·len·cy \-nsē, -si\
(plural equivalences also equivalencies)
Etymology: Middle French & Medieval Latin; Middle French equivalence, from Medieval Latin aequivalentia, from Late Latin aequivalent-, aequivalens + Latin -ia -y
1.
a. : the state or property of being equivalent : exchangeability, correspondence
< the equivalence of paper money and coins >
< the equivalence between the hero's career and that of the author >
: equatability
< the equivalence of mass and energy >
: geologic contemporaneity
< time equivalency of the Sly Gap to a portion of the Devonian of Iowa is suggested by new paleological evidence — Journal of Geology >
b. : an equivalent or an instance of equivalence
< a series of logical equivalences >
2. logic
a. : sameness in truth value; specifically : the logical relationship holding between two statements if they are either both true or both false — called also material equivalence; compare biconditional
b. : mutual deducibility or reciprocal entailment; specifically : the relationship holding between two statements if to affirm one and to deny the other would result in a contradiction — called also logical equivalence, strict equivalence
3. : equality in metrical value of a regular foot and one in which there are substitutions (as of a long syllable for two short syllables in quantitative verse or of two or more light unaccented syllables for the normal unaccented syllable in accentual or syllabic verse) |