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The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Obligor \Ob`li*gor"\, n. The person who binds himself, or gives his bond to another. --Blackstone.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"person who binds himself to another by contract," 1540s, agent noun in Latin form from oblige .

Wiktionary Word definitions in Wiktionary
n. (context legal finance English) The party bearing a legal obligation to another party, the obligee.