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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.).

Testify etymology ?

Testify detailed word origin explanation

Dictionary entryLanguageDefinition
faciendus Latin (lat)
teste Latin (lat)
testificor Latin (lat) I bring to light, demonstrate.. I testify, bear witness.
testifier Old French (842-ca. 1400) (fro)
testifien Middle English (1100-1500) (enm)
testify English (eng) To make a declaration, or give evidence, under oath.. To make a statement based on personal knowledge or faith.