late 14c., "follower of the philosophical system of Epicurus," from Old French Epicurien, or from epicure + -ian. From 1570s as "one devoted to pleasure." As an adjective, attested from 1580s in the philosophical sense and 1640s with the meaning "pleasure-loving."
word-forming element making nouns implying a practice, system, doctrine, etc., from French -isme or directly from Latin -isma, -ismus (source also of Italian, Spanish -ismo, Dutch, German -ismus), from Greek -ismos, noun ending signifying the practice or teaching of a thing, from the stem of verbs in -izein, a verb-forming element denoting the doing of the noun or adjective to which it is attached. For distinction of use, see -ity. The related Greek suffix -isma(t)- affects some forms.
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Definitions of epicureanism from WordNet
a doctrine of hedonism that was defended by several ancient Greek philosophers;