Adventitious
Defined in 3 dictionaries — Black's (1910), Black's (1891), Bouvier (1839)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
That which comes incidentally, fortuitously or out of the regular course. "Adventitious value" of lands, see Central R. Co., v. Sinte Board of Assessors, 49 N. J. Law, 1, 7 Atl. 306.
A Dictionary of Law
Henry Campbell Black · 1891
That which comes Incidentally, fortuitously, or out of the regular course.
A Law Dictionary, Adapted to the Constitution and Laws of the United States
John Bouvier · 1839
adventitius, from advenio,; what comes incidentally; as adventitia bona, goods that fall to a man otherwise than by inheritance; or adventitia dos, a dowry or portion given by some other friend beside the parent.