verb (used with object), excavated, excavating.
to make hollow by removing the inner part; make a hole or cavity in; form into a hollow, as by digging: The ground was excavated for a foundation.
to make (a hole, tunnel, etc.) by removing material.
to dig or scoop out (earth, sand, etc.).
to expose or lay bare by or as if by digging; unearth: to excavate an ancient city.

1590–1600; < Latin excavātus (past participle of excavāre to hollow out), equivalent to ex- ex-1 + cav(um) hollow, cave + -ātus -ate1

reexcavate, verb (used with object), reexcavated, reexcavating.
unexcavated, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
excavate (ˈɛkskəˌveɪt)
1.  to remove (soil, earth, etc) by digging; dig out
2.  to make (a hole, cavity, or tunnel) in (solid matter) by hollowing or removing the centre or inner part: to excavate a tooth
3.  to unearth (buried objects) methodically in an attempt to discover information about the past
[C16: from Latin excavāre, from cavāre to make hollow, from cavus hollow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1590s, from L. excavatus, pp. of excavare "to hollow out," from ex- "out" + cavare "to hollow," from cavus "cave." Related: Excavated; excavating.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Only a few wrecked buildings are being excavated-some of them belonging to shop-owners seeking to recover their stock.
The vast majority of oil sands bitumen is located too deep to be economically
  excavated through traditional mining practices.
Tour sites that have been excavated as well as non-excavated ones.
Seven of the tombs have been excavated and made accessible to the public, one
  of which has its own underground atrium.
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