Englishlegitimize
verb
the formal recognition of a union legitimizes workers' resistance to intimidation:
validate, legitimate, permit, warrant, authorize, sanction, license, give the stamp of approval to, condone, justify, vindicate, endorse, approve, support, sustain;
legalize, pronounce lawful, declare legal, decriminalize, normalize.
▷antonyms outlaw.
legitimize Oxford Dictionary of English