[adj] being under moral or legal obligation; "felt bound by his promise"
[adj] (biology) restricted to a particular condition of life; "an obligate anaerobe can survive only in the absence of OXYGen"
[v] bind by an obligation; cause to be indebted; "He's held by a contract"; "I'll hold you by your promise"
[v] commit in order to fulfill an obligation; "obligate money"
[v] force or compel somebody to do something; "We compel all students to fill out this form"