obligatory : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: obligatory	by the DICT Development Group
2 results for obligatory
From WordNet (r) 3.0 (2006) [wn]:
obligatory adj morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution" Antonym(s): optional required by obligation or compulsion or convention; "he made all the obligatory apologies"
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Obligatory \Ob"ligatory\, a. [L. obligatorius: cf.F. obligatoire.] Binding in law or conscience; imposing duty or obligation; requiring performance or forbearance of some act; -- often followed by on or upon; as, obedience is obligatory* on a soldier. As long as the law is obligatory, so long our obedience is due. --Jer. Taylor.