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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.
References in periodicals archive ?
Character does not exist as an entity because it functions coactively within the social context.
The unexpected findings of these preliminary studies on adult runners, compared with the enhanced maximal athletic performance in previous social facilitation literature (16,42,59,61), highlight the need for further experimental research on the behavioral and psychological effects of performing submaximal training coactively with others.
This can be achieved, for example, by affirming the other person's touching of the ball and coactively rolling it on the floor for a short time.