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Latin word testamentum comes from Latin testor (I am witness, testify, attest.. I make a will.), Latin instrumentum
testor (Latin)
I am witness, testify, attest.. I make a will.
instrumentum (Latin)
(collective) supply, provision. (general) paraphernalia, equipment. An instrument, tool, utensil. Records, documents.
testamentum (Latin)
Will, testament.