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
Those who plan to plant peonies this fall can excavate a few planting holes
  ahead of time.
Usually, they'll excavate a cavity in an old snag, or use a natural cavity in
  the same sort of structure.
There are no plans now to excavate any more remains, and those that have been
  excavated will be re-buried after study.
Researchers should locate these fossil poachers and fund them to excavate.
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