Plural of compaction; multiple instances or processes of making something compact; compressed states.
From 'compaction' (from 'compact' + '-ion' suffix) in plural form. Compaction as a noun emerged from geological and engineering terminology to describe the result of compacting processes.
Geologists study compactions in sedimentary rocks because the degree of compaction tells the story of how much time and pressure shaped ancient rock layers—it's like reading the compression history of Earth itself.
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