ris·i·bil·i·ty /ˌrɪzəˈbɪləti/
愛笑的性質,愛笑的癖性,對笑的感受性
Ris·i·bil·i·ty n. The quality of being risible; as, risibility is peculiar to the human species.
A strong and obvious disposition to risibility. --Sir W. Scott.
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risibility
n : a disposition to laugh