Also found in: Thesaurus, Medical, Legal, Wikipedia.


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.


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


(koʊˈæk ʃən)

1. joint action or interaction.
2. any interaction among organisms within an ecological community.
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"


Joint work toward a common end:
References in periodicals archive ?
Summary: A novel group of Co(II), Ni(II) and Cu(II) complexes of the species, [M(L)AcO(H2O)2]nH2O [n= 1,2 and 3] were synthesized by the coaction of Schiff base ligand, (LH) 4-{(E)-[(2-hydroxynaphthalen-1-yl)methylidene]amino}-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzenesulfonamide, derived from the concentration of 2-hydroxynaphthalene-1-carbaldehyde and sulfathiadiazole.
Social facilitation comprises two main circumstances: effects of coaction and audience effect (Zajonc, 1965).
Effects of coaction, expected evaluation, and goal setting on creativity and productivity.
From a specific partial entwining structure involving a Hopf algebra H and an algebra A, one can define what is a partial coaction of H on A and from a smash product structure involving the same ingredients, we obtain the notion of a partial action of H on A.
Malraux engages in a far-reaching metaphysical meditation on the ephemeral destiny (Greve, 2015) of the human species, using devices such as associationism, analogous arrangements, far-flung dialogue, temporal coaction, stereoscopic collocation, etc.
But the team showed to all and sundry that the game is played, not by one man, nor by skill alone, but by grit, coaction and hard work.
Supervisors and Bond and Coaction * Trainee Form: "My supervisees supervisor treats me with respect.
The coaction of the A8701G mutation and genetic factors caused by consanguineous marriage might affect this family with maternally inherited hypertension and dCMP.
Effects on coaction, expected evaluation, and goal setting on creativity and productivity.
Tenants remaining in the temporary Tech Park space are the Venture Center, Merger Match, iDatafy, CoAction, Noble Impact and OneTwoSee.
A perspective shift of the development pattern of the Chinese economy is required (Nica, 2013), one that rests on coaction of economic cost-effectiveness, social impartiality, energy security and green sustainability.