[uh-soh-see-ey-shuhn, -shee-]
an organization of people with a common purpose and having a formal structure.
the act of associating or state of being associated.
friendship; companionship: Their close association did not last long.
connection or combination.
the connection or relation of ideas, feelings, sensations, etc.; correlation of elements of perception, reasoning, or the like.
an idea, image, feeling, etc., suggested by or connected with something other than itself; an accompanying thought, emotion, or the like; an overtone or connotation: My associations with that painting are of springlike days.
Ecology. a group of plants of one or more species living together under uniform environmental conditions and having a uniform and distinctive aspect.
Chemistry. a weak form of chemical bonding involving aggregation of molecules of the same compound.

1525–35; (< Middle French) < Medieval Latin associātiōn- (stem of associātiō). See associate, -ion

associational, adjective
interassociation, noun
nonassociation, noun
nonassociational, adjective
proassociation, adjective
pseudoassociational, adjective
reassociation, noun
subassociation, noun
subassociational, adjective

1. alliance, union; society, company; band. 3. fellowship. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
association (əˌsəʊsɪˈeɪʃən, -ʃɪ-)
1.  a group of people having a common purpose or interest; a society or club
2.  the act of associating or the state of being associated
3.  friendship or companionship: their association will not last
4.  a mental connection of ideas, feelings, or sensations: association of revolution with bloodshed
5.  psychol See also free association the mental process of linking ideas so that the recurrence of one idea automatically recalls the other
6.  chem the formation of groups of molecules and ions, esp in liquids, held together by weak chemical bonds
7.  ecology a group of similar plants that grow in a uniform environment and contain one or more dominant species

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

1530s, "action of coming together," from L. associationem, noun of action from associatus, pp. of associare (see associate). Meaning "a body of persons with a common purpose" is from 1650s. Meaning "mental connection" is from 1680s; that of "quality or thing called to
mind by something else" is from 1810.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

association as·so·ci·a·tion (ə-sō'sē-ā'shən, -shē-)

  1. A connection of persons, things, or ideas by some common factor; union.

  2. A functional connection of two ideas, events, or psychological phenomena established through learning or experience.

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
association   (ə-sō'sē-ā'shən, -shē-)  Pronunciation Key 
A large number of organisms in a specific geographic area constituting a community with one or two dominant species.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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