Tac"it (?), a. [L. tacitus, p. p. of tacere to be silent, to pass over in silence; akin to Goth. þahan to be silent, Icel. þegja, OHG. dagēn: 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.