What Does it Mean?
1. a state of happiness, elation or bliss; often used in the phrase, “on cloud nine.”
2. Popular etymology references the 1896 edition of the International Cloud Atlas which defined ten types of clouds. The book defined the ninth cloud as the cumulonimbus, which rises to 10 km (6.2 miles), the highest a cloud can be.
3. Research also suggests the sense in this and other expressions might be because, “As the largest one-figure integer, nine is sometimes used for emphasis.” The phrase appears in the 1935 aviation-based play “Ceiling Zero” by Frank Wilber Wead.
Learn a little something from the Temptations’1968 hit single, “Cloud Nine.”