Definitions from Wiktionary (blue moon)

▸ noun:  (countable) An extra full moon that appears in a subdivision of a year, namely:
▸ noun:  The third full moon in a season that contains four rather than the usual three full moons.
▸ noun:  The second of two full moons that occur in the same calendar month (a definition created by mistake in the 20th century).
▸ noun:  (countable, rare) The moon tinted towards blue as it appears in the sky, caused by dust or smoke in the atmosphere.
▸ noun:  (countable, idiomatic, by extension) A long time.
▸ noun:  (uncountable) A bright blue, sweet-flavored ice cream that is popular in the Midwestern U.S. and is a component of Superman ice cream.
▸ Also see blue_moon


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