An improvement put upon an estate which enhances its value more than mere repairs. The term is also applied to denote the additional value which an estate acquires in consequence of some public improvement , as laying out or widening a street, eta French v. New York, loflfl How. Prac. (N. Y.) 220; Abell v. Brady, 79 Md. 94, 28 Atl. 817; Chase v. Sioux City, S6 Iowa, 603, 53 N. W. 333.