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
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 next seasonal blue moon won't take place until May 2027.
—John Tufts, The Indianapolis Star, 7 Aug. 2024
Tuesday’s moon followed the Aug. 19 super blue moon.
—Jaweed Kaleem, Los Angeles Times, 17 Sep. 2024
About 25% of all full moons are supermoons, while only 3% of full moons are considered blue moons.
—John Tufts, The Courier-Journal, 17 Sep. 2024
There are two types of blue moons: seasonal and monthly.
—Doyle Rice, The Indianapolis Star, 17 Aug. 2024
See all Example Sentences for blue moon 
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John Tufts, The Indianapolis Star, 7 Aug. 2024
Tuesday’s moon followed the Aug. 19 super blue moon.
—Jaweed Kaleem, Los Angeles Times, 17 Sep. 2024
About 25% of all full moons are supermoons, while only 3% of full moons are considered blue moons.
—John Tufts, The Courier-Journal, 17 Sep. 2024
There are two types of blue moons: seasonal and monthly.
—Doyle Rice, The Indianapolis Star, 17 Aug. 2024
See all Example Sentences for blue moon
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 23 Nov. 2024.
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