atavism

Meanings

1. The reappearance of an ancestral characteristic in an organism after several generations of absence; a throwback.
2. The recurrence or reversion to a past behaviour, method, characteristic or style after a long period of absence.
3. Reversion to past primitive behavior, especially violence.

Etymology

Etymology tree Proto-Indo-European *h₂éd Proto-Italic *ad Proto-Italic *ad- Latin at- Proto-Indo-European *h₂éwh₂os Latin avus Latin atavus Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ῐσμός (-ĭsmós)der. Latin -ismusbor. French -isme French atavismebor. English atavism Borrowed from French atavisme.. By surface analysis, at- (“to”) + Latin av(us) (“grandfather, ancestor”) + -ism. Compare ancestorism.