Black's Law Dictionary (2nd edition)dictionaries

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A usage or practice of tlie people, which, by common adoption and ac-quiesceuce. and by long aud uuvaryiug habit, has become compulsory, and has acquired the force of a law with respect to the place or subject-matter to which it relates. Adams v. Insurance Co., 95 Pa. 355. 40 Am. Rep. <5G2; Lindsay v. Cusimano (C. C.) 12 Fed. 504; Strother v. Lucas, 12 I’et. 445. 9 L. Eil. 1137; Minis v. Nelson (C. C.) 43 Fed. 779; Piinaud v. Jones, 1 Cal. 498; llursli v. North. 40 Pa. 241

Source: Black’s Law Dictionary 2nd Ed (1910)