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
However, there’s another type of blue moon.
—Hali Smith
may 30, Idaho Statesman, 30 May 2026
When will May's blue moon peak?
—Julia Gomez, USA Today, 30 May 2026
North Carolina sky gazers will get a chance to see the only blue moon of the year later this month, though catching it will require an early wake-up call.
—Charlotte Observer, 29 May 2026
The last blue moon was on August 31, 2023, and the next one will come on December 31, 2028, according to EarthSky.
—Connor Greene, Time, 29 May 2026
See All Example Sentences for blue moon
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Hali Smith
may 30, Idaho Statesman, 30 May 2026
When will May's blue moon peak?
—Julia Gomez, USA Today, 30 May 2026
North Carolina sky gazers will get a chance to see the only blue moon of the year later this month, though catching it will require an early wake-up call.
—Charlotte Observer, 29 May 2026
The last blue moon was on August 31, 2023, and the next one will come on December 31, 2028, according to EarthSky.
—Connor Greene, Time, 29 May 2026
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 31 May. 2026.
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