obligate

(verb) force somebody to do something. Synonyms: compel, oblige. Example: "We compel all students to fill out this form."

(verb) commit in order to fulfill an obligation. Example: "Obligate money."

(verb) bind by an obligation; cause to be indebted. Synonyms: oblige, bind, hold. Examples: "He's held by a contract." "I'll hold you by your promise."

(adj) restricted to a particular condition of life. Synonyms: obligate (vs. facultative). Example: "An obligate anaerobe can survive only in the absence of oxygen."