epiphenomenon.
An activity, process, or state that is the result of another; a by-product, a consequence.
Meaning & usage
An activity, process, or state that is the result of another; a by-product, a consequence.
A mental process or state that is an incidental by-product of physiological events in the brain or nervous system.
A symptom that develops during the course of a disease that is not connected to the disease.
Where this word comes from
Etymology tree Proto-Indo-European *h₁ep-der. Proto-Indo-European *h₁épsder. Proto-Indo-European *h₁épi Proto-Hellenic *epí Ancient Greek ἐπί (epí) Ancient Greek ἐπῐ- (epĭ-)der. English epi- Proto-Indo-European *bʰeh₂- Proto-Indo-European *-né- Proto-Indo-European *-yéti Proto-Indo-European *bʰh₂nyéti Proto-Hellenic *pʰáňňō Ancient Greek φαίνω (phaínō) Ancient Greek φαινόμενον (phainómenon)bor. Late Latin phaenomenonder. English phenomenon English epiphenomenon From epi- (prefix meaning ‘above, on, over; in addition to’) + phenomenon. Phenomenon is derived from Late Latin phaenomenon (“appearance”), from Ancient Greek φαινόμενον (phainómenon, “thing that appears in one’s view; appearance; phenomenon”), a noun use of the neuter singular form of φαινόμενος (phainómenos), the present middle or passive participle of φαίνω (phaínō, “to cause to appear; to reveal, show, uncover; to expound”), ultimately from Proto-Indo-European *bʰeh₂- (“to glow with light, to shine”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.