[ex.cur.sion] n [L excursion-, excursio, fr. excurrere] (1587) 1 a: a going out or forth: expedition b (1): a usu. brief pleasure trip (2): a trip at special reduced rates
2: deviation from a direct, definite, or proper course; esp: digression "needless ~s into abstruse theory" 3 a: a movement outward and back or from a mean position or axis; also: the distance traversed: amplitude "the ~ of a piston" b: one complete movement of expansion and contraction of the lungs and their membranes (as in breathing)