[kuhm-pak-shuhn, kom-]
the act of compacting or the state of being compacted.
Geology. the consolidation of sediments resulting from the weight of overlying deposits.

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. 2014.
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World English Dictionary
1.  closely packed together; dense
2.  neatly fitted into a restricted space
3.  concise; brief
4.  well constructed; solid; firm
5.  (foll by of) composed or made up (of)
6.  denoting a tabloid-sized version of a newspaper that has traditionally been published in broadsheet form
7.  logic (of a relation) having the property that for any pair of elements such that a is related to b, there is some element c such that a is related to c and c to b, as less than on the rational numbers
8.  (US), (Canadian) (of a car) small and economical
9.  to pack or join closely together; compress; condense
10.  (foll by of) to create or form by pressing together: sediment compacted of three types of clay
11.  metallurgy to compress (a metal powder) to form a stable product suitable for sintering
12.  a small flat case containing a mirror, face powder, etc, designed to be carried in a woman's handbag
13.  (US), (Canadian) a comparatively small and economical car
14.  metallurgy a mass of metal prepared for sintering by cold-pressing a metal powder
15.  a tabloid-sized version of a newspaper that has traditionally been publis hed in broadsheet form
[C16: from Latin compactus, from compingere to put together, from com- together + pangere to fasten]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. compaction, from L. compactionem "a putting or joining together," noun of action from compingere (see compact (adj.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
compaction   (kəm-pāk'shən)  Pronunciation Key 
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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Computing Dictionary

compaction definition


The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
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.
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