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Etymology 1[edit]

From Middle English coaccion, from Latin coāctiō.



  1. (obsolete) force; compulsion, either in restraining or impelling
    • November 9, 1662, Robert South, Of the Creation of Man in the Image of God
      It had the passions in perfect subjection; and though its command over them was persuasive and political, yet it had the force of coaction, and despotical.

Etymology 2[edit]

co- +‎ action


coaction (countable and uncountable, plural coactions)

  1. Collective or collaborative action.
    • 1997, Lauren B. Resnick, Discourse, Tools and Reasoning: Essays on Situated Cognition
      In the coaction condition, however, where the children did not have any opportunity to interact with one another, the mixed gender pairings produced a marked and statistically significant polarization of performance []
  2. (mathematics) The mapped version of an action to a cogroup.
    actions and coactions of measured groupoids on von Neumann algebras