co·ac·tion (k - k sh n)n. 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 co  cti, coctin-, a collecting, from coctus, past participle of cgere, to collect, condense; see coagulum. Senses 2 and 3 : co- + action.]co·ac tive adj.co·ac tive·ly adv. |
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