Definitions
1.VerbTo bind, compel, constrain, or oblige by a social, legal, or moral tie.
2.VerbTo cause to be grateful or indebted; to oblige.
3.VerbTo commit (money, for example) in order to fulfill an obligation.
4.AdjectiveRequiring a (specified) way of life, habitat, etc. .mw-parser-output .defdate{font-size:smaller}
5.AdjectiveIndispensable; essential; necessary; obligatory; mandatory; unavoidably invoked."In addition to being the obligate food source for monarch caterpillars, milkweeds also provide abundant nectar for the adult butterflies.; In some languages such signaling is optional, whereas in others it is obligate."
6.AdjectiveBound by oath, law or duty.
7.NounAn obligate organism.