from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The state or condition of being equivalent; equality.
  • noun Mathematics An equivalence relation.
  • noun Logic The relationship that holds for two propositions that are either both true or both false, so that the affirmation of one and the denial of the other results in contradiction.

from The Century Dictionary.

  • To be equivalent to; counterpoise.
  • noun The condition of being equivalent; equality in value; correspondence in signification, force, nature, or the like: as, a universal equivalence of weights and measures is extremely desirable; exact equivalence between different words is rare. Also equivalency.
  • noun In chem., capability of mutual replacement, in chemical combination, of definite quantities of different substances: thus, there is equivalence between approximately 18.07 parts of aluminium, 40.1 of calcium, 46.1 of sodium, and 55.9 of (ferrous) iron in combining with the same fixed quantity of oxygen.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb rare To be equivalent or equal to; to counterbalance.
  • noun The condition of being equivalent or equal; equality of worth, value, signification, or force.
  • noun Equal power or force; equivalent amount.
  • noun rare, rare 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. See Valence.
  • noun rare The degree of combining power as determined by relative weight. See Equivalent, n., 2.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun uncountable The condition of being equivalent or essentially equal.
  • noun countable, mathematics An equivalence relation; ; ~
  • noun uncountable, logic The relationship between two propositions that are either both true or both false.
  • verb transitive To be equivalent or equal to; to counterbalance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a state of being essentially equal or equivalent; equally balanced
  • noun essential equality and interchangeability
  • noun qualities that are comparable


Sorry, no etymologies found.


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