[ih-kwiv-uh-luhnt or for 5, ee-kwuh-vey-luhnt]
equal in value, measure, force, effect, significance, etc.: His silence is equivalent to an admission of guilt.
corresponding in position, function, etc.: In some ways their prime minister is equivalent to our president.
Geometry. having the same extent, as a triangle and a square of equal area.
Mathematics. (of two sets) able to be placed in one-to-one correspondence.
Chemistry. having the same capacity to combine or react chemically.
something that is equivalent.

1425–75; late Middle English < Late Latin aequivalent- (stem of aequivalēns), present participle of aequivalēre. See equi-, -valent

equivalently, adverb
nonequivalent, adjective, noun
nonequivalently, adverb
quasi-equivalent, adjective
quasi-equivalently, adverb
superequivalent, adjective, noun
unequivalent, adjective
unequivalently, adverb

equivalent, equivocal.

1. See equal.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
equivalency or equivalence (ˌɛkwɪˈveɪlənsɪ)
chem the state of having equal valencies
equivalence or equivalence
equi'valent or equivalence

equivalent (ɪˈkwɪvələnt)
1.  equal or interchangeable in value, quantity, significance, etc
2.  having the same or a similar effect or meaning
3.  maths
 a.  having a particular property in common; equal
 b.  (of two equations or inequalities) having the same set of solutions
 c.  (of two sets) having the same cardinal number
4.  maths, logic (of two propositions) having an equivalence between them
5.  something that is equivalent
6.  short for equivalent weight
[C15: from Late Latin aequivalēns, from aequivalēre to be equally significant, from Latin aequi-equi- + valēre to be worth]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-15c., from L.L. aequivalentem (nom. aequivalens) "equivalent," pp. of aequivalere "be equivalent," from L. aequus "equal" + valere "be well, be worth" (see valiant).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

equivalent e·quiv·a·lent (ĭ-kwĭv'ə-lənt)
Equal, as in value, force, or meaning.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
equivalent   (ĭ-kwĭv'ə-lənt)  Pronunciation Key 
  1. Equal, as in value, meaning, or force.

    1. Of or relating to a relation between two elements that is reflexive, symmetric, and transitive.

    2. Having a one-to-one correspondence, as between parts. Two triangles having the same area are equivalent, as are two congruent geometric figures.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The findings suggest that if patients receive equivalent treatment, the outcomes for blacks and whites can be strikingly similar.
Taking the nearest equivalent country from 2009 data reveals some surprises.
The effect is the visual equivalent of a long, cool drink of water.
This is the modern-day equivalent of hippies freaking out the squares.
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