HILARITY Meaning of HILARITY in English hi ‧ lar ‧ i ‧ ty /hɪˈlærəti, hɪˈlærɪti/ BrE AmE noun [uncountable] laughter, or a feeling of fun:Eva joined in the hilarity as much as anyone. Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012