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The third full moon in a quarter that contains four rather than the usual three full moons.

Additional definitions for 'blue moon':

blue moonA long time.
blue moonSomething absurd.
blue moonThe moon tinted towards blue as it appears in the sky, caused by dust or smoke in the atmosphere.
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"blue moon." Phrases.net. STANDS4 LLC, 2017. Web. 17 Nov. 2017. <http://www.phrases.net/phrase/blue-moon_2481>.

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