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Etymology 1Edit

Latin coactio.



  1. (obsolete) force; compulsion, either in restraining or impelling
    (Can we find and add a quotation of South to this entry?)

Etymology 2Edit

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