[ik-skur-zhuhn, -shuhn]
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.
the range of stroke of any moving part.
the stroke itself.
Obsolete. a sally or raid.
verb (used without object)
to go on or take an excursion.
of, pertaining to, or intended for use on excursions: an excursion fare; an excursion bus.

1565–75; < Latin excursiōn- (stem of excursiō). See excursus, -ion

excursional, excursionary, adjective
preexcursion, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
excursion (ɪkˈskɜːʃən, -ʒən)
1.  a short outward and return journey, esp for relaxation, sightseeing, etc; outing
2.  a group of people going on such a journey
3.  (modifier) of or relating to special reduced rates offered on certain journeys by rail: an excursion ticket
4.  a digression or deviation; diversion: an excursion into politics
5.  (formerly) a raid or attack
6.  physics
 a.  a movement from an equilibrium position, as in an oscillation
 b.  the magnitude of this displacement
7.  the normal movement of a movable bodily organ or part from its resting position, such as the lateral movement of the lower jaw
8.  machinery the locus of a point on a moving part, esp the deflection of a whirling shaft
[C16: from Latin excursiō an attack, from excurrere to run out, from currere to run]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1570s, "a deviation in argument," from L. excursionem (nom. excursio) "a running forth, excursion," from excursum, pp. of excurrere "run out," from ex- "out" + currere "to run" (see current). Sense of "journey" recorded in English by 1660s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She'll need salt, so we're planning a group beach excursion to harvest salt
It's also difficult to combine dining with a pub excursion given the tight
  opening hours.
It occurs to me an excursion in etymology led to an excursion in gastronomy led
  to a question about nuts.
Thirteen sixth graders are milling around, preparing to set off on a daylong
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