adjective
 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 onetoone correspondence.
 Chemistry. having the same capacity to combine or react chemically.
noun
 something that is equivalent.
adjective
 equal or interchangeable in value, quantity, significance, etc
 having the same or a similar effect or meaning
 maths
 having a particular property in common; equal
 (of two equations or inequalities) having the same set of solutions
 (of two sets) having the same cardinal number
 maths logic (of two propositions) having an equivalence between them
noun
 something that is equivalent
 short for equivalent weight
adj.early 15c., from Middle French equivalent and directly from Late Latin aequivalentem (nominative aequivalens) “equivalent,” present participle of aequivalere “be equivalent,” from Latin aequus “equal” (see equal) + valere “be well, be worth” (see valiant). As a noun from c.1500. adj.
 Equal, as in value, force, or meaning.
 Equal, as in value, meaning, or force.

 Of or relating to a relation between two elements that is reflexive, symmetric, and transitive.
 Having a onetoone correspondence, as between parts. Two triangles having the same area are equivalent, as are two congruent geometric figures.