Risibility

(n.) The quality of being risible; as, risibility is peculiar to the human species.

Thesaurus Entries

Homeric laughter, belly laugh, boff, boffola, burst of laughter, cachinnation, cackle, chortle, chuckle, convulsion, crow, fit of laughter, funny bone, gales of laughter, giggle, guffaw, ha-ha, hearty laugh, hee-haw, hee-hee, hilarity, ho-ho, horselaugh, laugh, laughing, laughter, outburst of laughter, peal of laughter, roar of laughter, sense of humor, shout, shout of laughter, shriek, snicker, snigger, snort, tee-hee, titter, yuck, yuk-yuk