Verb

• S: (v) compel (compel%2:41:00::), oblige (oblige%2:41:00::), obligate (obligate%2:41:00::) (force somebody to do something) "We compel all students to fill out this form"
• S: (v) obligate (obligate%2:40:00::) (commit in order to fulfill an obligation) "obligate money"
• S: (v) oblige (oblige%2:32:00::), bind (bind%2:32:00::), hold (hold%2:32:13::), obligate (obligate%2:32:00::) (bind by an obligation; cause to be indebted) "He's held by a contract"; "I'll hold you by your promise"

Adjective

• S: (adj) obligate (obligate%3:00:00::) (restricted to a particular condition of life) "an obligate anaerobe can survive only in the absence of oxygen"