blue moon
noun
1
: a very long period of time
—usually used in the phrase once in a blue moon
such people happen along only once in a blue moon—
Saturday Rev.
Saturday Rev.2
: a second full moon in a calendar month
Examples of blue moon in a Sentence
once in a blue moon we'll get dressed up and eat in a fancy restaurant
Recent Examples on the Web
The last time this lunar event occurred was August 2023, and the next super blue moons are projected for January and March of 2037.
—Alexandra Banner, CNN, 19 Aug. 2024
Read on for what August's full super blue moon means for you according to your zodiac sign, per Kyle Thomas' predictions!
—Skyler Caruso, Peoplemag, 17 Aug. 2024
August's full moon has several names, including supermoon, blue moon and Sturgeon Moon.
—Marley Malenfant, Austin American-Statesman, 16 Aug. 2024
And whenever that happens, astronomers call the third full moon a seasonal blue moon.
—John Tufts, The Indianapolis Star, 7 Aug. 2024
See All Example Sentences for blue moon
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Alexandra Banner, CNN, 19 Aug. 2024
Read on for what August's full super blue moon means for you according to your zodiac sign, per Kyle Thomas' predictions!
—Skyler Caruso, Peoplemag, 17 Aug. 2024
August's full moon has several names, including supermoon, blue moon and Sturgeon Moon.
—Marley Malenfant, Austin American-Statesman, 16 Aug. 2024
And whenever that happens, astronomers call the third full moon a seasonal blue moon.
—John Tufts, The Indianapolis Star, 7 Aug. 2024
See All Example Sentences for blue moon
Cite this Entry
“Blue moon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blue%20moon. Accessed 3 Apr. 2025.
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