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English definition of “happy”

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happy

adjective uk   /ˈhæp.i/ us  

happy adjective (PLEASED)

A1 feeling, showing, or causing pleasure or satisfaction: a happy marriage/childhood She looks so happy. School days are said to be the happiest days of your life. Nicky seems a lot happier since she met Steve. You'll be happy to know that Jean is coming with us. I'm perfectly happy to (= I will willingly) help out. I'm so happy (that) everything is working out for you. Barry seems happy enough working for himself. Are you happy about/with (= satisfied with) your new working arrangements? Your mother's not going to be very happy when she sees the mess you've made! formal The manager will be happy (= is willing) to see you this afternoon.
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happy adjective (GREETING)

A1 [before noun] (used in greetings for special occasions) full of enjoyment and pleasure: Happy Birthday! Happy Anniversary! Happy New Year!
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happy adjective (LUCKY)

[before noun] (of a condition or situation) lucky: We hadn't planned to be in France at the same time as Ann and Charles - it was just a happy coincidence.

happy adjective (SUITABLE)

literary (of words or behaviour) suitable: It wasn't a happy choice of phrase given the circumstances.
(Definition of happy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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