• Absolutely indispensable; essential.
  • (biology) Able to exist or survive only in a particular environment or by assuming a particular role.

    "an obligate parasite; an obligate anaerobe."


  • (transitive, Canada, US, Scotland) To cause to be grateful or indebted; to oblige.
  • (transitive, Canada, US, Scotland) To bind, compel, constrain, or oblige by a social, legal, or moral tie.
  • (transitive, Canada, US, Scotland) To commit (money, for example) in order to fulfill an obligation.

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