a hole or cavity made by excavating.
the act of excavating.
an area in which excavating has been done or is in progress, as an archaeological site.

1605–15; < Latin excavātiōn- (stem of excavātiō) a hollowing. See excavate, -ion

excavational, adjective
nonexcavation, noun
reexcavation, noun

1. See hole.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1610s, "action of excavating," from L. excavationem, noun of action from excavare (see excavate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

excavation ex·ca·va·tion (ěk'skə-vā'shən)

  1. A natural cavity, pouch, or recess.

  2. A cavity formed artificially or as the result of a pathological process.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
So of course there has been little done in this area to conduct scientific
The data on these prehistoric humans come from cave excavations in lowland wet
Ruins and basic excavations dot the grounds, and the surrounding rainforests
  are rich in bird and animal life.
Excavations of a series of sites in this region have recovered items left
  behind by what may have been that progenitor population.
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