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From cachinnate +‎ -ion


cachinnation (countable and uncountable, plural cachinnations)

  1. Loud, convulsive laughter.
    • 1920, Peter B. Kyne, chapter V, in The Understanding Heart:
      His shrill, mirthless cachinnation followed Monica as she headed up-hill.
    • 1928, H. P. Lovecraft, The Dunwich Horror:
      After midnight their shrill notes burst into a kind of pandemoniac cachinnation which filled all the countryside, and not until dawn did they finally quiet down.

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