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1. An impelling or restraining force; a compulsion.
2. Joint action.
3. Ecology Any of the reciprocal actions or effects, such as symbiosis, that can occur in a community.

[Middle English coaccioun, from Latin coāctiō, coāctiōn-, a collecting, from coāctus, past participle of cōgere, to collect, condense; see coagulum. Senses 2 and 3 : co- + action.]

co·ac′tive adj.
co·ac′tive·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Environmental Science) any relationship between organisms within a community
2. joint action
3. obsolete a force or compulsion, either to compel or restrain
[C17: co- + action]
coˈactive adj
coˈactively adv
ˌcoacˈtivity n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(koʊˈæk ʃən)

1. joint action or interaction.
2. any interaction among organisms within an ecological community.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.coaction - act of working jointly; "they worked either in collaboration or independently"
cooperation - joint operation or action; "their cooperation with us was essential for the success of our mission"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


Joint work toward a common end:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Next we observe that partial dualization r(C [G]) can never return a group ring (except for a direct product, for which it coincides with r'), because the coaction of A on K is trivial, so to be self-dual the action would have to be trivial as well resulting in a direct product.
OCBs make organizational routines more successful by reconciling gulfs in organizational practices (Devine, 2015) and cohering coaction. Continuance commitment occurs when workers confront significant switching expenses on account of a sensed absence of appropriate alternative employers.
Design team: Karen Shakman, Principal and Design Architect; Brian Crawford, Job Captain; Donald Wieser, Project Architect (Coaction Group); Melinda Webster, Awarded General Contractor (A.R.
Define [rho]: [epsilon] [right arrow] [epsilon] [direct sum] D by [rho] := (1 [direct sum] f) [[DELTA].sub.[epsilon]], which gives a coaction so that [epsilon] is a Hopf module and a comodule algebra over V.
Current research was directed towards exploring this possibility of a positive coaction between the hop compounds and several antibiotics.
Effects of coaction, expected evaluation and goal setting on creativity and productivity.
The stated grounds for decision were the "coaction," in Black's words, of the First and Fourteenth Amendments.
Since these capabilities are systemwide but are located neither at the unit-level nor at the "deep" level, they escape the attention of neorealists even though the operational logic of the Waltzian system defined as coaction of units depends on the types of interaction capabilities.
Maritime Coaction OC.World 16/06/19 Not Sched 10,285 Coils Nil
The unit module is k with coaction [1.sub.k] [??] [1.sub.H].