epigeneticPronunciation: /ˌɛpɪdʒɪˈnɛtɪk/Definition of epigenetic adjective 1 Biology relating to or arising from non-genetic influences on gene expression:epigenetic carcinogens relating to or of the nature of epigenesis. 2 Geology formed later than the surrounding or underlying rock formation. Derivatives epigenetically adverb epigenetic in other Oxford dictionaries Definition of epigenetic in the US English dictionary