1. in a tacit manner
; by unexpressed agreement
; - Example: "they are tacitly expected to work 10 hours a day"
The Collaborative International Dictionary of English v.0.48:
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.
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.
WordNet (r) 3.0 (2006):
adv 1: in a tacit manner; by unexpressed agreement; "they are
tacitly expected to work 10 hours a day"