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Definition of validate : To confirm; to render valid; to give legal force to.

Synonyms:

study at verify, formalise, bear out, back, evidence, legalize, formalize, stamp, show, justify, true, underpin

proclaim, pronounce, accept, propound, maintain, testify, claim, avouch, admit, corroborate, profess, contend, endorse, express, support, state, declare, assure, warrant, verify, certify, acknowledge, sustain, adjure, approve, affirm, submit, pledge, set down, aver, attest, promise, assert, ratify

enable, enfranchise, agree, commission, designate, bless, empower, deputize, countersign, license, denominate, notarize, ordain, entitle

document, exhibit, betoken, observe, prove, illustrate, determine, exemplify, vouch, connote, establish, indicate, substantiate, depose, manifest, witness, demonstrate, adduce, evince

authorize, approbate, permit, confirm, consent, sanction, assent, authenticate, underwrite

Usage examples:

• The law was framed to validate a procedure more or less established by mining custom. - "The Economic Aspect of Geology", C. K. Leith.
• Let there be no mistake about it: we have been brought here to validate that conclusion. - "Human Error", Raymond F. Jones.
• The subsequent approbation of the Senate being necessary to validate a treaty, they expect to be consulted beforehand, if the case admits. - "Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson", Thomas Jefferson.