To vindicate is defined as to clear someone of criticism or blame.(verb)
Providing evidence in a trial that proves a suspect’s innocence is an example of vindicate.
Vindicate is defined as to justify an opinion or belief.(verb)
A politician who lays out all the reasons he was pushing for a controversial policy is an example of vindicate.
See vindicate in Webster's New World College Dictionary
Origin: < L vindicatus, pp. of vindicare, to claim, avenge < ? vim, force (see vim) + dicere, to say: see diction
See vindicate in American Heritage Dictionary 4
transitive verb vin·di·cat·ed, vin·di·cat·ing, vin·di·cates
Origin: Latin vindicāre, vindicāt-
Origin: , from vindex, vindic-, surety, avenger; see deik- in Indo-European roots.
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