Obligate

Ob´li`gate

v. t.	1.	To bring or place under obligation, moral or legal; to hold by a constraining motive. [imp. & p. p. Obligated ; p. pr. & vb. n. Obligating.] That's your true plan - to obligate The present ministers of state. - Churchill.
	2.	To bind or firmly hold to an act; to compel; to constrain; to bind to any act of duty or courtesy by a formal pledge. That they may not incline or be obligated to any vile or lowly occupations. - Landor.

Verb	1.	obligate - force or compel somebody to do something; "We compel all students to fill out this form" Synonyms: compel, oblige
	2.	obligate - commit in order to fulfill an obligation; "obligate money"
	3.	obligate - bind by an obligation; cause to be indebted; "He's held by a contract"; "I'll hold you by your promise" Synonyms: oblige, bind, hold
Adj.	1.	obligate - restricted to a particular condition of life; "an obligate anaerobe can survive only in the absence of OXYGen" Antonyms: facultative - able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte"