Definition of tacit adjective from the Oxford Advanced Learner's Dictionary

 

tacit

 adjective
adjective
BrE BrE//ˈtæsɪt//
 
; NAmE NAmE//ˈtæsɪt//
 
[usually before noun]
 
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that is suggested indirectly or understood, rather than said in words tacit approval/support/knowledge By tacit agreement, the subject was never mentioned again. Word Origin early 17th cent. (in the sense ‘wordless, noiseless’): from Latin tacitus, past participle of tacere ‘be silent’.
See the Oxford Advanced American Dictionary entry: tacit