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Entry 1 sense Webster, 1913

cloud nine

· cloud· nine · IPA /ˈklaʊd ˈnaɪn/
01 n. a state of extreme or perfect happiness; used especially in the phrase on cloud nine.
  1. 1.
    a state of extreme or perfect happiness; used especially in the phrase on cloud nine.
Syn. bliss, blissfulness, seventh-heaven.