Etymology
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glaciation (n.)

1640s, "act of freezing," noun of action from past participle stem of Latin glaciare "to freeze," from glacies "ice" (probably from a suffixed form of PIE root *gel- "cold; to freeze"). Geological sense of "presence of a mass of ice covering a region" is from 1863.

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Definitions of glaciation

glaciation (n.)
the condition of being covered with glaciers or masses of ice; the result of glacial action;
Agassiz recognized marks of glaciation all over northern Europe
glaciation (n.)
the process of covering the earth with glaciers or masses of ice;
From wordnet.princeton.edu