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Meaning of obligatory

o•blig•a•to•ry

Pronunciation: (u-blig'u-tôr"ē, -tōr"ē, ob'li-gu-), [key]
— adj.
  1. required as a matter of obligation; mandatory: A reply is desirable but not obligatory.
  2. incumbent or compulsory (usually fol. by on or upon): duties obligatory on all.
  3. imposing moral or legal obligation; binding: an obligatory promise.
  4. creating or recording an obligation, as a document.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
obligato oblige