American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Certainly, it's only the off-stage magic of history's most eidetic regime that rescues his film from risibility.— Blogposts | guardian.co.uk
I glanced hurriedly behind me to see if I could discover the cause of his risibility, and, failing to do so, turned round again, just in time to see him, with his eye- glass still bearing straight in my direction, bend his head and speak a few words to his fair companion.— The Congo Rovers A Story of the Slave Squadron
Tom found it impossible to resist the violent impulse to risibility which the ludicrous appearance of the old lady excited, and as no serious injury was sustained, determined to enjoy the fun If e'er a pleasant mischief sprang to view At once o'er hedge and ditch away he flew Nor left the game till he had run it down Approaching her with all the gravity of countenance he was master of--"Madam," says he, "are we to consider you as one of the Sylvan Deities who preside over these scenes, or connected in any way with the vehicle?"— Real Life In London, Volumes I. and II. Or, The Rambles And Adventures Of Bob Tallyho, Esq., And His Cousin, The Hon. Tom Dashall, Through The Metropolis; Exhibiting A Living Picture Of Fashionable Characters, Manners, And Amusements In High And Low Life (1821)
First, so that human nature be the cause thereof: thus risibility is befitting to Socrates by reason of human nature, being caused by its principles.— Summa Theologica, Part III (Tertia Pars) From the Complete American Edition

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