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Answer for the clue "Period of glaciation ", 7 letters:
ice age

Word definitions for ice age in dictionaries

Wikipedia Word definitions in Wikipedia
" Ice Age " is a song by American post-industrial group How to Destroy Angels from their second release, An Omen EP . It is also one of four songs from the extended play to be featured on their first full-length release, Welcome Oblivion .

Wiktionary Word definitions in Wiktionary
n. Any of several cold periods in the history of the earth marked by episodes of extensive glaciation alternating with episodes of relative warmth.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ice \Ice\ ([imac]s), n. [OE. is, iis, AS. [=i]s; aksin to D. ijs, G. eis, OHG. [=i]s, Icel. [=i]ss, Sw. is, Dan. iis, and perh. to E. iron.] Water or other fluid frozen or reduced to the solid state by cold; frozen water. It is a white or transparent colorless ...

WordNet Word definitions in WordNet
n. any period of time during which glaciers covered a large part of the earth's surface; "the most recent ice age was during the Pleistocene" [syn: glacial period , glacial epoch ]

Usage examples of ice age.

It looked thirteen, but the lips smiled a cool self-infatuated seventeen, while the gleaming deep eye-pools were first blue melt of the Ice Age.

The _Dolphin_, I had to admit, made any British submarine I'd ever seen look like a relic from the Ice Age.

They'll have full status in a few millennia, and they'll keep it, once they're assured of a cultural foundation that's not going to be shattered by a new ice age every time it gets started.

The problem is we're still in the interglacial warming that began at the end of the last Ice Age, and that warming sends what we call a thermal pulse down through the polar ice sheets.

The flood was an accident, a geological catastrophe like an ice age or a meteor impact.