Entry 1 sense Webster, 1913 Epicureanism · Ep·i·cu·re·an·ism · IPA /ˌɛpɪˈkju(ə)ɹiənɪzəm/ 01 n. Attachment to the doctrines of Epicurus; the principles or belief of Epicurus. 1. Attachment to the doctrines of Epicurus; the principles or belief of Epicurus.