What do a.m. and p.m. stand for?


[kuh m-pak-shuh n, kom-] /kəmˈpæk ʃən, kɒm-/
the act of compacting or the state of being compacted.
Geology. the consolidation of sediments resulting from the weight of overlying deposits.
Origin of compaction
1350-1400; Middle English compaccioun < Latin compāctiōn- (stem of compāctiō) a joining, frame, equivalent to compāct(us) compact1 + -iōn- -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for compaction
  • More frequent measurements are encouraged to account for compaction of the snow.
  • The blue hue of the ice is formed over centuries of ice compaction as the glacier flows down towards the lake.
  • The result, over time, is genome reduction and compaction.
  • More important, the compaction helps ensure that settlement is smooth and even.
  • Refuse collection and compaction equipment standards.
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.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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compaction in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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compaction in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010
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