Middle French or Latin; tacite moyen, from the Latin tacitus silent, from the last participation of tac?re to be silent; Similar to the Old German dag?n to keep silent These example phrases are automatically selected from different sources of online messages to reflect the current use of the word “tacit”. The opinions expressed in the examples do not give the opinion of Merriam-Webster or its publishers. Send us feedback. See the full definition of tacit in English Learners Dictionary Britannica English: Translation of tacit for Arabic Speakers. . . .