1. producing or capable of producing an intended effect; adequate.
  2. valid or binding, as an agreement or document.


  1. capable of or successful in producing an intended result; effective
  2. (of documents, agreements, etc) having legal force

late 14c., Old French effectuel, from Late Latin effectualis, from Latin effectus “accomplishment, performance” (see effect (n.)). Used properly of actions (not agents) and with a sense “having the effect aimed at.” Related: Effectually; effectuality.

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