Obligate - Definition

adj 1: restricted to a particular condition of life; "an
obligate anaerobe can survive only in the absence of
oxygen" [ant: facultative]
v 1: force somebody to do something; "We compel all students to
fill out this form" [syn: compel, oblige, obligate]
2: commit in order to fulfill an obligation; "obligate money"
3: bind by an obligation; cause to be indebted; "He's held by a
contract"; "I'll hold you by your promise" [syn: oblige,
bind, hold, obligate]