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Definition of Blue moon
1. Noun. A long time. "Something that happens once in blue moon almost never happens"
Definition of Blue moon
1. Noun. (rare) The moon tinted towards blue as it appears in the sky, caused by dust or smoke in the atmosphere. ¹
2. Noun. (archaic) Something absurd. ¹
3. Noun. (obsolete) The third full moon in a quarter that contains four rather than the usual three full moons. ¹
4. Noun. (idiomatic) (context: by extension) A long time. ¹
5. Noun. A flavor of sweet ice cream that is popular in the Midwestern U.S. and is a component of Superman ice cream. ¹
6. Noun. The second of two full moons that occur in the same calendar month. ¹
¹ Source: wiktionary.com