the act or process of forming or the state of being formed: the formation of ice.
the manner in which a thing is formed; disposition of parts; formal structure or arrangement.
a particular disposition of troops, as in columns, squares, etc.
any required assembling of the soldiers of a unit.
a body of rocks classed as a stratigraphic unit for geologic mapping. Compare member ( def 8 ).
the process of depositing rock or mineral of a particular composition or origin.

1375–1425; late Middle English formacioun < Latin fōrmātiōn- (stem of fōrmātiō), equivalent to fōrmāt(us) (see form, -ate1) + -iōn- -ion

formational, adjective
misformation, noun
nonformation, noun
self-formation, noun
subformation, noun
superformation, noun

1. establishment, founding, organization. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
formation (fɔːˈmeɪʃən)
1.  the act of giving or taking form, shape, or existence
2.  something that is formed
3.  the manner in which something is formed or arranged
4.  a.  a formal arrangement of a number of persons or things acting as a unit, such as a troop of soldiers, aircraft in flight, or a football team
 b.  (as modifier): formation dancing
5.  geology
 a.  the fundamental lithostratigraphic unit
 b.  a series of rocks with certain characteristics in common
6.  ecology a community of plants, such as a tropical rainforest, extending over a very large area

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., from O.Fr. formation or directly from L. formationem (nom. formatio), from formare to form (see form).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

formation for·ma·tion (fôr-mā'shən)

  1. The act or process of forming something or of taking form.

  2. Something formed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
formation   (fôr-mā'shən)  Pronunciation Key 
A long, mappable body of rock that is recognizable by its physical characteristics and by its location within the rock record.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But it was primarily tied to the lack of new business formation.
Responsible for the formation of clergy and their ongoing training.
Small sugar fragments can set off a signal cascade that increases inflammation
  and scar formation.
But in a few caves the conditions were ideal for formation of a different kind
  of treasure.
Images for formation
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