glaciation

Etymology
From, from.

Noun

 * 1) The process of covering with a glacier, or the state of being glaciated; the production of glacial phenomena; an ice age
 * 2) A particular instance of glacier formation.
 * 3) The act of freezing.
 * 1) A particular instance of glacier formation.
 * 2) The act of freezing.
 * 1) The act of freezing.
 * 1) The act of freezing.