an excursion, journey, or voyage made for some specific purpose, as of war or exploration.
the group of persons, ships, etc., engaged in such an activity: a large expedition of scientists and military personnel.
promptness or speed in accomplishing something: He worked with great expedition.

1400–50; late Middle English < Latin expedītiōn- (stem of expedītiō) a (military) traveling. See expedite, -ion

preexpedition, noun

1. See trip1. 3. quickness, dispatch, alacrity.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expedition (ˌɛkspɪˈdɪʃən)
1.  an organized journey or voyage for a specific purpose, esp for exploration or for a scientific or military purpose
2.  the people and equipment comprising an expedition
3.  a pleasure trip; excursion
4.  promptness in acting; dispatch
[C15: from Latin expedītiō, from expedīre to prepare, expedite]

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

early 15c., "military campaign; the act of rapidly setting forth," from L. expeditionem, noun of action from expidere (see expedite). Meaning "journey for some purpose" is from 1590s. Sense by 1690s also included the body of persons on such a journey. Related: Expeditionary.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No trip with teenage daughters is complete without shopping expeditions.
The cost of space expeditions is rapidly being lowered.
Keeping the kids occupied during fieldwork expeditions calls for special tools
  in some parts of the world.
Carter demonstrated which foods were safe, led foraging expeditions, and
  communicated through chimp vocalizations.
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