ta ‧ cit /ˈtæsət, ˈtæsɪt/ BrE AmE adjective
[ Date: 1600-1700 ; Language: French ; Origin: tacite , from Latin tacitus , from tacere 'to be silent' ]
tacit agreement, approval, support etc is given without anything actually being said SYN unspoken :
a tacit agreement between the three big companies
—tacitly adverb