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Synonyms
ob·li·gate (ŏb́lĭ-gāt́)

[Latin obligāre, obligāt-; see oblige.]

transitive verb: -gat·ed, -gat·ing, -gates. 

  1. To bind, compel, or constrain by a social, legal, or moral tie. See synonyms at force
  2. To cause to be grateful or indebted; oblige.
  3. To commit (money, for example) in order to fulfill an obligation.

adjective 

  1. Biology Able to exist or survive only in a particular environment or by assuming a particular role: an obligate parasite; an obligate anaerobe.
  2. Absolutely indispensable; essential.

derivatives

ob́li·ga·ble
adjective
ob́li·gate·ly
adverb
ob́li·gátor
noun