Obligate
WordNet
adjective
(1) Restricted to a particular condition of life
"An obligate anaerobe can survive only in the absence of OXYGen"
verb
(2) Bind by an obligation; cause to be indebted
"He's held by a contract"
"I'll hold you by your promise"
(3) Commit in order to fulfill an obligation
"Obligate money"
(4) Force or compel somebody to do something
"We compel all students to fill out this form"
WiktionaryText
Verb
- To bind, compel, or constrain by a social, legal, or moral tie. See Synonyms at force.
- To cause to be grateful or indebted; to oblige.
- 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.
- Absolutely indispensable; essential.