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obligatory

[ uh-blig-uh-tawr-ee, -tohr-ee, ob-li-guh- ]
/ əˈblɪg əˌtɔr i, -ˌtoʊr i, ˈɒb lɪ gə- /
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See synonyms for: obligatory / obligatoriness on Thesaurus.com

adjective

required as a matter of obligation; mandatory: A reply is desirable but not obligatory.
incumbent or compulsory (usually followed 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.

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Origin of obligatory

1425–75; late Middle English <Late Latin obligātōrius binding, equivalent to Latin obligā(re) to bind (see obligate) + -tōrius-tory1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for obligatory

obligatory
/ (ɒˈblɪɡətərɪ, -trɪ) /

adjective

required to be done, obtained, possessed, etc
of the nature of or constituting an obligation
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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