transitive verb. To compel or constrain by a social, legal, or moral requirement. synonym: force.

transitive verb. To cause to be grateful or indebted; oblige.

transitive verb. To commit (money, for example) in order to fulfill an obligation.

adjective. Able to exist or survive only in a particular environment or by assuming a particular role.

noun. An obligate organism.

To bind by legal or moral tie, as by oath, indenture, or treaty; bring under legal or moral obligation; hold to some specific act or duty; pledge.

To place under obligation in any way, as on account of continued favors or repeated acts of kindness; make beholden or indebted; constrain by considerations of duty, expediency, courtesy, etc.

Constrained or bound; having of necessity a particular character, or restricted to a particular course.

noun. An obligate parasite. See quotation under obligate, a.

transitive verb. To bring or place under obligation, moral or legal; to hold by a constraining motive.

transitive verb. To bind or firmly hold to an act; to compel; to constrain; to bind to any act of duty or courtesy by a formal pledge.

verb. To bind, compel, or constrain by a social, legal, or moral tie. See Synonyms at force.

verb. To cause to be grateful or indebted; to oblige.

verb. To commit (money, for example) in order to fulfill an obligation.

adjective. Able to exist or survive only in a particular environment or by assuming a particular role: an obligate parasite; an obligate anaerobe.

adjective. Absolutely indispensable; essential.

verb. force somebody to do something

verb. commit in order to fulfill an obligation

adjective. restricted to a particular condition of life

verb. bind by an obligation; cause to be indebted