Definition of: excursion

(ik·skûr′zhən, -shən) noun
1. A short journey, usually for pleasure.
2. A boat or train trip at reduced rates, accommodating groups of excursionists to specified points.
3. A body of excursionists collectively.
4. A digression; deviation.
5. A running out or going forth.
6. Physics Half the amplitude of vibration; the movement of a vibrating or oscillating body from its mean to either of its extreme states or positions.
7. Astron. The apparent movement to and fro of a heavenly body, as of a satellite about its primary. See synonyms under JOURNEY. [<L excursio, -onis <excurrere. See EXCURRENT.]