Obligatory Definition
 ə-blĭgə-tôrē, ŏblĭ-gə- 
    adjective
  
 Legally, morally, or socially binding; constituting, or having the nature of, an obligation; required.
Webster's New World 
Required as part of a routine course of action or cultural expectation; predictable.
 American Heritage 
Webster's New World 
Obligate.
 American Heritage Medicine 
Synonyms: 
  Origin of Obligatory
-  
From Latin obligare obligate, from ob- to + ligare to bind, from Proto-Indo-European *leig- to bind.
From Wiktionary
 
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