: a feeling of well-being or elation —usually used with on still on cloud nine weeks after winning the championship.

Why do we say I'm on Cloud 9?

In September, 1896, cumulonimbus, the greatest cloud in the world, was listed as Cloud 9 in a new cloud classification, and so to be on cloud nine became like floating on the tallest cloud on Earth. The story began with Sir Ralph Abercromby, who became fascinated by meteorology while serving in the British Army.

How do you use Cloud 9 in a sentence?

a state of extreme happiness. (1) He was on cloud nine after winning the competition. (2) When Michael was born I was on cloud nine. (3) She has been on cloud nine since the magazine printed the story she wrote.