[gley-shee-eyt, -see-]
verb (used with object), glaciated, glaciating.
to cover with ice or glaciers.
to affect by glacial action.
verb (used without object), glaciated, glaciating.
to become frozen or covered with ice or glaciers.

1615–25; < Latin glaciātus (past participle of glaciāre to freeze), equivalent to glaci(ēs) ice + -ātus -ate1

glaciation, noun
unglaciated, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glaciate (ˈɡleɪsɪˌeɪt)
1.  to cover or become covered with glaciers or masses of ice
2.  (tr) to subject to the effects of glaciers, such as denudation and erosion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Glaciation would have reduced the volume of water in the ocean, storing it as
Fjords are found in locations where current or past glaciation extended below
  current sea level.
Well, mostly glaciation with intermittent warming periods.
Ultimately endless warming would cause a lot of problems but glaciation through
  a new ice age would certainly be much, much worse.
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