Define happy . happy synonyms, happy pronunciation, happy translation, English dictionary definition of happy . adj. hap·pi·er , hap·pi·est 1. Enjoying, showing, or marked by pleasure, satisfaction, or joy. See Synonyms at glad . 2. Cheerful; willing: happy to help.... Official Music Video for " Happy " by Pharrell Williams Listen to Pharrell: https://PharrellWilliams.lnk.to/listenYD Subscribe to the official Pharrell YouTube channel: https://PharrellWilliams.lnk... Discover everything about the word " HAPPY " in English: meanings, translations, synonyms, pronunciations, examples, and grammar insights - all in one comprehensive guide. Definition of happy adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.