/ ˈtæsɪt; NAmE / adjective
[ usually before noun ] that is suggested indirectly or understood, rather than said in words :
tacit approval / support / knowledge
By tacit agreement , the subject was never mentioned again.
► tacit·ly adverb
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WORD ORIGIN
early 17th cent. (in the sense wordless, noiseless ): from Latin tacitus , past participle of tacere be silent.