• synonyms


[kuh m-pak-shuh n, kom-]
  1. the act of compacting or the state of being compacted.
  2. Geology. the consolidation of sediments resulting from the weight of overlying deposits.
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Origin of compaction

1350–1400; Middle English compaccioun < Latin compāctiōn- (stem of compāctiō) a joining, frame, equivalent to compāct(us) compact1 + -iōn- -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for compaction

Historical Examples

  • This compaction in love will lead to a wealth of certitude in the possession of the truth.

    The Expositor's Bible: Colossians and Philemon

    Alexander Maclaren

  • Each is drawing toward the other, but like glass in the mid-state between fusion and compaction a single sand will splinter it.

    Anima Poet

    Samuel Taylor Coleridge

Word Origin and History for compaction


late 14c., from Old French compaction, from Latin compactionem (nominative compactio) "a putting or joining together," noun of action from past participle stem of compingere (see compact (adj.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

compaction in Science


  1. The process by which the porosity of a given form of sediment is decreased as a result of its mineral grains being squeezed together by the weight of overlying sediment or by mechanical means.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.