atavism

Word family

• atavistic
  adjectiveC2
• atavistically
  adverbC2

Synonym discussion

Sense: noun/1

Atavism refers specifically to the reappearance of traits or behaviours from an earlier evolutionary or historical stage — it carries a hint of the primitive. Throwback is more informal and broader: anything old-fashioned can be a throwback, and the word often has a warm, nostalgic tone. Regression implies a harmful backward slide — a patient regresses to an earlier mental state, a country to authoritarianism. Reversion is the most technical of the four, appearing in legal, biological, and property contexts. Think of atavism as an evolutionary echo, throwback as a fond look back, regression as a harmful retreat, and reversion as a formal return. You would call your uncle's vinyl collection a throwback, not an atavism; a patient's loss of speech after a stroke would be a regression, not an atavism.

Common collocations

Etymology

Borrowed from French atavisme in the 1830s, which was coined from Latin atavus meaning 'great-great-great-grandfather' or 'remote ancestor' (from at- 'beyond' + avus 'grandfather'). It first appeared in biological writing to describe the sudden reappearance of an ancestral trait after generations of absence — a horse born with extra toes, for example. By the late 1800s the word had broadened to describe the recurrence of any old custom, instinct, or way of thinking in modern society.