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[af-ter-i-fekt, ahf-] /ˈæf tər ɪˌfɛkt, ˈɑf-/
a delayed effect; an effect that follows at some interval after the stimulus that produces it.
Medicine/Medical. a result appearing after the first effect due to an agent, usually a drug, has gone.
Origin of aftereffect
First recorded in 1810-20; after + effect Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for after-effect
Contemporary Examples
Historical Examples
  • Little she knew him, or guessed the after-effect of her words.

    Olive Dinah Maria Craik, (AKA Dinah Maria Mulock)
  • The after-effect of light is modified by the duration of exposure to light.

  • The after-effect at the maximum is a recovery to the normal equilibrium.

  • It was the after-effect of his long and difficult river experience.

    Carmen Ariza Charles Francis Stocking
  • Most of us, perhaps, have felt this after-effect of dreaming on our waking thoughts.

    Illusions James Sully
  • The same is true of the after-effect of the stimulus of light.

  • There was no suggestion of an after-effect of the slight concussion of the brain which had rendered him insensible.

    The Velvet Glove Henry Seton Merriman
  • The news seemed to stun both men at first, but the after-effect on each was wonderfully different.

    Red Rooney R.M. Ballantyne
  • The after-effect of intense cold is seen in the condition of inexcitability persisting for a very long period in the morning.

    Life Movements in Plants Sir Jagadis Chunder Bose
British Dictionary definitions for after-effect


any result occurring some time after its cause
(med) any delayed response to a stimulus or agent Compare side effect
(psychol) any illusory sensation caused by a stimulus that has ceased
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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