mass hysteria

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mass hysteria (uncountable)

  1. (psychology) The sociopsychological phenomenon in which a large group of people exhibit the same or similar hysterical symptoms simultaneously.
    • 1974 December, Lewis D. Polk, “Mass Hysteria in an Elementary School”, in Clinical Pediatrics, volume 13, number 12, DOI:10.1177/000992287401301202, pages 1013:
      However, these make no mention of mass hysteria or give any suggestion that hysteria may affect multiple individuals at one time in a special situation.