ex·cur·sion

[ik-skur-zhuhn, -shuhn]
noun
1.
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.
2.
a trip on a train, ship, etc., at a reduced rate: weekend excursions to mountain resorts.
3.
the group of persons making such a journey: an excursion of tourists.
4.
a deviation or digression: excursions into futile philosophizing.
5.
Physics. the displacement of a body or a point from a mean position or neutral value, as in an oscillation.
6.
an accidental increase in the power level of a reactor, usually forcing its emergency shutdown.
7.
Machinery.
a.
the range of stroke of any moving part.
b.
the stroke itself.
8.
Obsolete. a sally or raid.
verb (used without object)
9.
to go on or take an excursion.
00:10
Excursion is a GRE word you need to know.
So is excruciate. Does it mean:
to inflict severe pain upon; torture:
force out, thrust out
adjective
10.
of, pertaining to, or intended for use on excursions: an excursion fare; an excursion bus.

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

ex·cur·sion·al, ex·cur·sion·ar·y, adjective
pre·ex·cur·sion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
excursion (ɪkˈskɜːʃən, -ʒən) [Click for IPA pronunciation guide]
 
n
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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Etymonline
Word Origin & History

excursion
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
See a whale breach the ocean's surface from the comfort of your ship, or take
  an adventurous shore excursion panning for gold.
It occurs to me an excursion in etymology led to an excursion in gastronomy led
  to a question about nuts.
For the best conditions, try timing your excursion for weekdays in the early
  morning-and after the afternoon traffic.
The allure is great, but there's always a possibility that the excursion will
  not end well.
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