a short trip or outing to some place, usually for a special purpose and with the intention of a prompt return

a pleasure excursion; a scientific excursion.

a trip on a train, ship, etc., at a reduced rate

weekend excursions to mountain resorts.

the group of persons making such a journey

an excursion of tourists.

a deviation or digression

excursions into futile philosophizing.

Physics . the displacement of a body or a point from a mean position or neutral value, as in an oscillation.

an accidental increase in the power level of a reactor, usually forcing its emergency shutdown.

Machinery .

the range of stroke of any moving part.

the stroke itself.

Obsolete . a sally or raid.

to go on or take an excursion.

of, pertaining to, or intended for use on excursions

an excursion fare; an excursion bus.

noun

circuit , cruise , day trip , digression , expedition , jaunt , junket , outing , picnic , pleasure trip , ramble , round trip , safari , tour , trek , trip , walk , wandering , aside , deviation , divagation , divergence , divergency , excursus , irrelevancy , parenthesis , tangent , diversion , hike , journey , ride , sail , sortie , voyage