Tacit \Tac"it\, a. [L. tacitus, p. p. of tacere to be silent, to pass over in silence; akin to Goth. [thorn]ahan to be silent, Icel. [thorn]egja, OHG. dag[=e]n: cf. F. tacite. Cf. Reticent.]

Done or made in silence; implied, but not expressed; silent; as, tacit consent is consent by silence, or by not interposing an objection. -- Tac"it*ly, adv.

The tacit and secret theft of abusing our brother in civil contracts. --Jer. Taylor.

Source: Webster's Revised Unabridged Dictionary (1913)