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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.
2
: a second full moon in a calendar month
Synonyms
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 beer and the actual blue moon come around far more frequently than a total solar eclipse, but the beverage pairs well with the rarest of celestial events.
—
Jason Rossi, The Enquirer, 5 Apr. 2024
The second full moon in a calendar month is often referred to as a blue moon, according to the Farmers Almanac.
—
The Arizona Republic, 23 Feb. 2024
And if two full moons occur within a calendar month, which happens every so often, the second one is a called a blue moon.
—
Terri Robertson, Country Living, 31 July 2023
Starting off with a special seasonal blue moon on Aug. 19, which will be the last blue moon until May 20, 2027.
—
Carlie Procell, The Courier-Journal, 25 Jan. 2024
See all Example Sentences for blue moon ![](/dist-cross-dungarees/2024-06-13--14-08-27-z5loc/images/svg/redesign/arrow-right-exemplar.svg)
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'blue moon.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1821, in the meaning defined at sense 1
Dictionary Entries Near blue moon
Cite this Entry
“Blue moon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blue%20moon. Accessed 15 Jun. 2024.
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