愛笑的性質,愛笑的癖性,對笑的感受性
Risibility \Ris`i*bil"i*ty\, n. [CF. F. risibilit['e].] The quality of being risible; as, risibility is peculiar to the human species. A strong and obvious disposition to risibility. --Sir W. Scott.
risibility n : a disposition to laugh