Pronunciation: (i-fekt'),[key] —n. 1. something that is produced by an agency or cause; result; consequence: Exposure to the sun had the effect of toughening his skin. 2. power to produce results; efficacy; force; validity; influence: His protest had no effect. 3. the state of being effective or operative; operation or execution; accomplishment or fulfillment: to bring a plan into effect. 4. a mental or emotional impression produced, as by a painting or a speech.
5. meaning or sense; purpose or intention: She disapproved of the proposal and wrote to that effect. 6. the making of a desired impression: We had the feeling that the big, expensive car was only for effect. 7. an illusory phenomenon: a three-dimensional effect. 8. a real phenomenon (usually named for its discoverer): the Doppler effect. 9. See special effects. 10. in effect, a. for practical purposes; virtually: His silence was in effect a confirmation of the rumor. b. essentially; basically.
c. operating or functioning; in force: The plan is now in effect. 11. take effect, a. to go into operation; begin to function.
b. to produce a result: The prescribed medicine failed to take effect.
—v.t. to produce as an effect; bring about; accomplish; make happen: The new machines finally effected the transition to computerized accounting last spring.