cloud nine

noun Informal.
a state of perfect happiness (usually in the phrase on cloud nine ).

1955–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

cloud nine
by 1950, sometimes also cloud seven (1956, perhaps by confusion with seventh heaven), Amer.Eng., of uncertain origin or significance. Some connect the phrase with the 1896 International Cloud-Atlas, long the basic source for cloud shapes, in which, of the ten cloud types, cloud No. 9, cumulonimbus, was
the biggest, puffiest, most comfortable-looking. The phrase might appear in the aviation-based play "Ceiling Zero" by Frank Wilber Wead (1935).
Online Etymology Dictionary, © 2010 Douglas Harper
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