C15: from Late Latin aequivalēns, from aequivalēre to be equally significant, from Latin aequi-equi- + valēre to be worth
Word Origin and History for equivalent
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.
equivalent in Medicine
equivalent e·quiv·a·lent (ĭ-kwĭv'ə-lənt) adj. Equal, as in value, force, or meaning.
equivalent in Science
equivalent
(ĭ-kwĭv'ə-lənt)
Equal, as in value, meaning, or force.
Of or relating to a relation between two elements that is reflexive, symmetric, and transitive.
Having a one-to-one correspondence, as between parts. Two triangles having the same area are equivalent, as are two congruent geometric figures.