Open English Wordnet
Verbs
(v)compel, oblige, obligateforce somebody to do something“We compel all students to fill out this form” (v)obligatecommit in order to fulfill an obligation“obligate money” (v)oblige, bind, hold, obligatebind by an obligation; cause to be indebted“He's held by a contract”,
“I'll hold you by your promise” Adjectives
(a)obligaterestricted to a particular condition of life“an obligate anaerobe can survive only in the absence of oxygen”