obligatory up on

obligatory

[uh-blig-uh-tawr-ee, -tohr-ee, ob-li-guh-]
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:
1425–75; late Middle English < Late Latin obligātōrius binding, equivalent to Latin obligā(re) to bind (see obligate) + -tōrius -tory1

obligatorily [uh-blig-uh-tawr-uh-lee, ‐tohr‐, ob-li-guh, uh-blig-uh-tawr-uh-lee, tohr, ob-li-guh] , adverb
obligatoriness, noun
nonobligatorily, adverb
nonobligatory, adjective
unobligatory, adjective


2. necessary, imperative.


2. voluntary.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obligatory (ɒˈblɪɡətərɪ, -trɪ)
 
adj
1.  required to be done, obtained, possessed, etc
2.  of the nature of or constituting an obligation
 
ob'ligatorily
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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