Definition of happy

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< happi coat

happy-go-lucky >

hap·py    (hp) KEY 

ADJECTIVE:
hap·pi·er, hap·pi·est

1. Characterized by good luck; fortunate.
2. Enjoying, showing, or marked by pleasure, satisfaction, or joy.
3. Being especially well-adapted; felicitous: a happy turn of phrase.
4. Cheerful; willing: happy to help.
5. 1. Characterized by a spontaneous or obsessive inclination to use something. Often used in combination: trigger-happy.
   2. Enthusiastic about or involved with to a disproportionate degree. Often used in combination: money-happy; clothes-happy.

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ETYMOLOGY:
Middle English, from hap, luck ; see hap

OTHER FORMS:
happi·ly(Adverb), happi·ness(Noun)

SYNONYMS:
happy, fortunate, lucky, providential

These adjectives mean attended by luck or good fortune: a happy outcome; a fortunate omen; a lucky guess; a providential recovery. See also Synonyms at glad¹.