Obligation

An obligation bounds one to do something, be something, or act in a certain way.

That which a person is bound to do or forbear; any duty imposed by law, promise, contract, relations of society, courtesy, kindness, etc. Goodwin v. Freadrich, 135 Neb. 203, 280 N.W. 917, 923.

Duty. Rucks-Brandt Const. Co. v. Price, 165 Oki. 178, 23 P.2d 690.

Duty imposed by law. Helvering v. British-American Tobacco Co., C.C.A., 69 F.2d 528, 530

Black’s Law Dictionary, 4^th Edition Page 1223