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An effect following its cause after some delay, especially a delayed or prolonged physiological or psychological response to a stimulus.


1. any result occurring some time after its cause
2. (Medicine) med any delayed response to a stimulus or agent. Compare side effect
3. (Psychology) psychol any illusory sensation caused by a stimulus that has ceased


(ˈæf tər ɪˌfɛkt, ˈɑf-)

a delayed effect, as one that follows at some interval after the stimulus that produced it.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.aftereffect - any result that follows its cause after an intervalaftereffect - any result that follows its cause after an interval
consequence, effect, result, upshot, outcome, event, issue - a phenomenon that follows and is caused by some previous phenomenon; "the magnetic effect was greater when the rod was lengthwise"; "his decision had depressing consequences for business"; "he acted very wise after the event"
2.aftereffect - a delayed effect of a drug or therapyaftereffect - a delayed effect of a drug or therapy; "the drug had unexpected aftereffects"
effect - a symptom caused by an illness or a drug; "the effects of sleep loss"; "the effect of the anesthetic"
References in periodicals archive ?
Summary: Nagapattinam (Tamil Nadu) [India], Nov 17 (ANI): The aftereffect of cyclone Gaja has unsettled the daily lives of large number of residents of Tamil Nadu's Nagapattinam district.
Cortical orientation tuning and the tilt aftereffect
Hearing loss A is the most common aftereffect of meningitis.
To determine whether a particular resistance load condition induced an aftereffect, we compared the magnitude of the first stride during the postadaptation period and the baseline of each variable measured.
In a series of studies, Matsumiya took advantage of a phenomenon called the "face aftereffect" to investigate whether our visual system responds to nonvisual signals for processing faces.
The haze, an aftereffect of fossil-fuel burning, forest-fire smoke and emissions from stoves burning wood and animal waste, has been hanging over Asia and is now moving to other areas of the globe.
Psychologists call this the "motion aftereffect." In the laboratory, when a person views a moving visual pattern, the same pattern appears to drift in the opposite direction when it is stopped.
Scientists try to find the answers to this age-old illusion that was first documented by Aristotle, and later called the Motion Aftereffect by today's scientists.
One in three of those who survive bacterial meningitis are left with aftereffects such as brain damage, hearing and sight loss, and where septicaemia has occurred, loss of limbs and scarring.
There was a significant reduction (p = .05) in death rate from 12.6% to 7.3% and a decrease in the percentage of discharge with aftereffects from 32.8% to 22.8%.