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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] As long as the law is obligatory, so long our obedience is due. --Jer. Taylor. [1913 Webster]