PRECARIUM. The name of a contract among civilians, by which the owner of a thing at the request of another person, gives him a thing to use as long as the owner shall please. Poth. h.t. n. 87. See Yelv. 172; Cro. Jac. 236; 9 Cowen, 687; Roll. R. 128; Bac. Ab. Bailment, c; Ersk. Prin. B. 3, t. 1, n. 9; Wolff, Ins. Nat. Sec. 333. 2. A tenancy at will is a right of this kind.