excursion
ex.cur.sion \ik-'sk*r-zh*n\ n [L excursion-, excursio, fr. excursus, pp. of excurrere] often attrib 1a: a going out or forth : EXPEDITION 1b1: a usu. brief pleasure trip 1b2: a trip at special reduced rates 2: deviation from a direct or proper course; esp : DIGRESSION 3a: a movement outward or from a mean position or axis; also : the distance traversed : AMPLITUDE 3b: one complete movement of expansion and contraction of the lungs and the ir membranes