To support or establish the certainty or validity of; verify:
To verify is to confirm the accuracy or truth of something.
To constitute supporting evidence; give substantiation:
To cause to move backward or in a reverse direction:
To make more certain the validity of; confirm; bolster; support
To make evident; indicate; show
(Law) To show an adequate reason for something done
To make a statement based on personal knowledge in support of an asserted fact; bear witness:
To guarantee (a product).
Demonstrate means to march or protest against something with a group.
To set up (a government, nation, business, etc.); found; institute
To show (oneself) to be what is specified or to have a certain characteristic:
Show is defined as to bring into view, teach, or display.
To verify; to make good; to substantiate; to establish; to sustain.
(Biol.) With the same inherited trait or traits as a parent; without variation
To prove, as by reference to documents
Find another word for authenticate. In this page you can discover 25 synonyms, antonyms, idiomatic expressions, and related words for authenticate, like: confirm, verify, vouch, attest, back, bear out, corroborate, evidence, justify, substantiate and testify.