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obligatory

[uh-blig-uh-tawr-ee, -tohr-ee, ob-li-guh-] /əˈblɪg əˌtɔr i, -ˌtoʊr i, ˈɒb lɪ gə-/
adjective
1.
required as a matter of obligation; mandatory:
A reply is desirable but not obligatory.
2.
incumbent or compulsory (usually followed 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.
Origin
late Middle English
1425-1475
1425-75; late Middle English < Late Latin obligātōrius binding, equivalent to Latin obligā(re) to bind (see obligate) + -tōrius -tory1
Related forms
obligatorily
[uh-blig-uh-tawr-uh-lee, ‐tohr‐, ob-li-guh‐, uh-blig-uh-tawr-uh-lee, ‐tohr‐, ob-li-guh‐] /əˈblɪg əˌtɔr ə li, ‐ˌtoʊr‐, ˈɒb lɪ gə‐, əˌblɪg əˈtɔr ə li, ‐ˈtoʊr‐, ˌɒb lɪ gə‐/ (Show IPA),
adverb
obligatoriness, noun
nonobligatorily, adverb
nonobligatory, adjective
unobligatory, adjective
Synonyms
2. necessary, imperative.
Antonyms
2. voluntary.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un obligatory

obligatory

/ɒˈblɪɡətərɪ; -trɪ/
adjective
1.
required to be done, obtained, possessed, etc
2.
of the nature of or constituting an obligation
Derived Forms
obligatorily, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un obligatory

obligatory

adj.

c.1400, from Old French obligatoire "creating an obligation, obligatory," and directly from Late Latin obligatorius "binding," from obligat-, past participle stem of obligare (see oblige).

Online Etymology Dictionary, © 2010 Douglas Harper
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