Reconnaissance definitions

rĭ-kŏn'ə-səns, -zəns
An inspection or exploration of an area, especially one made to gather military information.
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An exploratory survey or examination, as in seeking out information about enemy positions or installations, or as in making a preliminary geologic or engineering survey.
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Reconnaissance is preliminary research or a preliminary survey such as checking out the lay-of-the-land before taking a military action.

An example of reconnaissance is when the military has a mission to go to an area and survey the enemy positions.

noun
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The act of scouting or exploring (especially military or medical) to gain information.
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Origin of reconnaissance

French from Old French reconoissance recognition from reconoistre reconoiss- to recognize recognize