What is the meaning of blue moon?

noun

  • A long time.
    • usage: "something that happens once in blue moon almost never happens"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). blue moon. Retrieved September 20, 2026, from http://smartdefine.org/blue_moon/definitions/1250295
ChicagoWordNet. 2010. "blue moon" http://smartdefine.org/blue_moon/definitions/1250295 (accessed September 20, 2026).
HarvardWordNet 2010, blue moon, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/blue_moon/definitions/1250295>.
MLAWordNet. "blue moon" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/blue_moon/definitions/1250295>