cachinnation

From cachinnate +‎ -ion.

• IPA^(key): /kakɪˈneɪʃ(ə)n/

cachinnation (countable and uncountable, plural cachinnations)

1. Loud, convulsive laughter.
   • 1842, [anonymous collaborator of Letitia Elizabeth Landon], chapter LVIII, in Lady Anne Granard; or, Keeping up Appearances. […], volume III, London: Henry Colburn, […], OCLC 1000392275, page 116:

     Mr. Palmer had a keen perception of the ludicrous; he was naturally a humourist, which was indicated by a peculiar twinkle of the eye-lid at those times when he determined to repress a hearty cachinnation, and pursue the subject that tickled him to its utmost.

   • 1912, Ambrose Bierce, “For Brevity and Clarity”, in The Collected Works of Ambrose Bierce, volume 11, pages 386–387:

     While reforming the language I crave leave to introduce an improvement of punctuation—the snigger point, or note of cachinnation. It is written thus ‿ and represents, as early as may be, a smiling mouth.

   • 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.

• cachinnator
• cachinnatory