Obligatory
Pronunciation : Ob"li*ga*to*ry
Part of Speech : a.
Etymology : [L. obligatorius: cf.F. obligatoire.]
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913