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obligatory: Meaning and Definition of
o•blig•a•to•ry
Pronunciation: (u-blig'u-tr"?, -t?r"?, ob'li-gu-), [key] ? adj.
- required as a matter of obligation; mandatory: A reply is desirable but not obligatory.
- incumbent or compulsory (usually fol. by on or upon): duties obligatory on all.
- imposing moral or legal obligation; binding: an obligatory promise.
- creating or recording an obligation, as a document.
Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease.