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English word testify comes from Latin faciendus, Latin teste, and later Latin testificor (I bring to light, demonstrate.. I testify, bear witness.)
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faciendus (Latin)
teste (Latin)
testificor (Latin)
I bring to light, demonstrate.. I testify, bear witness.
testifier (Old French)
testifien (Middle English)
testify (English)
To make a declaration, or give evidence, under oath.. To make a statement based on personal knowledge or faith.