The word "hilarity" in English means: Great amusement and noisy fun, often accompanied by laughter., A state or situation characterized by boisterous merriment or amusement..
The phonetic transcription of "hilarity" is /hɪˈlær.ə.ti/ in British English and /hɪˈler.ə.ti/ in American English. Click the 🔊 button to hear both pronunciations.