as in forever
a long or seemingly long period of time
once in a blue moon we'll get dressed up and eat in a fancy restaurant
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Recent Examples of blue moon
Tuesday's supermoon will mark the second of four consecutive supermoons, the next being Thursday, Oct. 17:
Aug. 19: super blue moon
Sept. 17: supermoon, harvest moon and partial lunar eclipse
Oct. 17: supermoon
Nov. 15: supermoon
More:Missed the rare super blue moon?
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Alexis Simmerman, Austin American-Statesman, 16 Sep. 2024
This month’s rare super blue moon peaks at 11:25 a.m.
—Kelsie Gibson, Peoplemag, 16 Aug. 2024
Whenever that happens, astronomers call the third full moon a seasonal blue moon.
—John Tufts, The Courier-Journal, 21 July 2024
The second full moon in a calendar month is often referred to as a blue moon, according to the Farmers Almanac.
—Tiffany Acosta, The Arizona Republic, 24 Feb. 2024
See all Example Sentences for blue moon 
Alexis Simmerman, Austin American-Statesman, 16 Sep. 2024
This month’s rare super blue moon peaks at 11:25 a.m.
—Kelsie Gibson, Peoplemag, 16 Aug. 2024
Whenever that happens, astronomers call the third full moon a seasonal blue moon.
—John Tufts, The Courier-Journal, 21 July 2024
The second full moon in a calendar month is often referred to as a blue moon, according to the Farmers Almanac.
—Tiffany Acosta, The Arizona Republic, 24 Feb. 2024
See all Example Sentences for blue moon
Recent Examples of Synonyms for blue moon
Noun
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One way to mess with an option team’s Plan A is to not only stick them with third-and-forevers, but to put them in an early hole, making them throw out of desperation.Sean Keeler, The Denver Post, 14 Sep. 2019
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Printed with thermochromic ink, the stamp reveals a second image of the moon when a finger is pressed to it, and a sheet of 16 Forever stamps features a map of the eclipse path.Meg Jones, Milwaukee Journal Sentinel, 18 Aug. 2017
Noun
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Reduce longs, trim, sell calls — do something, before — as the expression goes — someone does it for you.Carter Braxton Worth, CNBC, 4 Oct. 2024
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Then again, the fact it’s gone on this long is surprising in its own right.David Lombardi, The Athletic, 23 Aug. 2024
Noun
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Key Facts The moon will reach peak illumination at around 4 a.m. EST on Sunday, and will rise and set at its northernmost points on the horizon of any moon in decades.Mary Whitfill Roeloffs, Forbes, 14 Dec. 2024
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Together, Juno’s flybys have enabled an unprecedented look at the smoldering moon, including taking observations of its poles for the first time.Ashley Strickland, CNN, 13 Dec. 2024
Noun
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At age 24, Tisdale was officially diagnosed with alopecia areata.Brian Mastroianni, Health, 12 Dec. 2024
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According to recent reports, the number of people living to age 100 is expected to quadruple over the next 30 years.Andrew Rosen, Forbes, 12 Dec. 2024
Thesaurus Entries Near blue moon
Cite this Entry
“Blue moon.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/blue%20moon. Accessed 21 Dec. 2024.
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