Definition of atavism in English:

atavism

noun

mass noun
  • 1A tendency to revert to something ancient or ancestral.

    ‘the more civilized a society seems to be, the more susceptible it is to its buried atavism’
    1. 1.1Biology Recurrence of traits of an ancestor in a subsequent generation.

Pronunciation

atavism

/ˈatəvɪz(ə)m/