Meaning

noun a profession of belief

noun a legal document declaring a person's wishes regarding the disposal of their property when they die

noun strong evidence for something

originFrom Middle English testament, from Old French testament, from Latin testāmentum (“the publication of a will, a will, testament, in Late Latin one of the divisions of the Bible”), from testor (“to be a witness, testify, attest, make a will”), from testis (“one who attests, a witness”).

Etymology from Wiktionary, CC BY-SA 3.0