From The Collaborative International Dictionary of English v.0.48:

Obligatory \Ob"li*ga*to*ry\, a. [L. obligatorius: cf. F.
   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
   [1913 Webster]

         As long as the law is obligatory, so long our obedience
         is due.                                  --Jer. Taylor.
   [1913 Webster]
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