Etymology
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happiness (n.)

1520s, "good fortune," from happy + -ness. Meaning "pleasant and contented mental state" is from 1590s. Phrase greatest happiness for the greatest number was in Francis Hutcheson (1725) but later was associated with Bentham.

updated on May 19, 2015

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Definitions of happiness from WordNet

happiness (n.)
state of well-being characterized by emotions ranging from contentment to intense joy;
Synonyms: felicity
happiness (n.)
emotions experienced when in a state of well-being;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.