obligate (v.)

1540s, "to bind, fasten, connect," the literal sense of the Latin word, now obsolete in English; 1660s in the main modern sense of "to put under moral obligation;" a back-formation from obligation, or else from Latin obligatus, past participle of obligare "to bind, bind up, bandage," figuratively "put under obligation" (see oblige). Oblige, with which it has been confused since late 17c., means "to do one a favor." Related: Obligated; obligating.

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Definitions of obligate from WordNet
obligate (v.)
force somebody to do something;
Synonyms: compel / oblige
obligate (v.)
commit in order to fulfill an obligation;
obligate money
obligate (v.)
bind by an obligation; cause to be indebted;
Synonyms: oblige / bind / hold
obligate (adj.)
restricted to a particular condition of life;
an obligate anaerobe can survive only in the absence of oxygen