Hypertext Webster Gateway: "obligatory"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Obligatory \Ob"li*ga*to*ry\, 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.
From WordNet (r) 1.7 (wn)
obligatory
adj 1: morally or legally constraining or binding; "attendance is
obligatory"; "an obligatory contribution" [ant: {optional}]
2: required by obligation or compulsion or convention; "he made
all the obligatory apologies"
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