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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Example Sentences
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Recent Examples of blue moon
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
The second of these moons is called a blue moon — a calendrical blue moon, to be precise.
—Avni Trivedi, CNN Money, 29 May 2026
The third full moon in a single season with four full moons is also sometimes referred to as a blue moon, though the actual color of the lunar disk remains normal for both definitions!
—Anthony Wood, Space.com, 1 May 2026
The next calendrical blue moons are expected in December 2028 and September 2031.
—Ginnie Sandoval, Oklahoman, 28 Apr. 2026
See All Example Sentences for blue moon
Connor Greene, Time, 29 May 2026
The second of these moons is called a blue moon — a calendrical blue moon, to be precise.
—Avni Trivedi, CNN Money, 29 May 2026
The third full moon in a single season with four full moons is also sometimes referred to as a blue moon, though the actual color of the lunar disk remains normal for both definitions!
—Anthony Wood, Space.com, 1 May 2026
The next calendrical blue moons are expected in December 2028 and September 2031.
—Ginnie Sandoval, Oklahoman, 28 Apr. 2026
See All Example Sentences for blue moon
Recent Examples of Synonyms for blue moon
Noun
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Miami trailed 1-0 fast, in the sixth minute, when the defense left Guilherme Biro unmarked for a downward header off a corner kick, gifting Biro the forever-history of the first goal in the new stadium.—
Miami Herald,
Miami Herald,
5 Apr. 2026
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Those tush-pushes can’t beat you if The Winter Soldier’s facing third-and-forevers.—
Joe Nguyen,
Denver Post,
17 Jan. 2026
Noun
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Etna, a battle-scarred but kindhearted shepherd mix who was plucked from his home on the eve of an unspecified conflict in an unnamed country, has grown weary of war’s brutalities and longs to return to the coastal farm of his puppyhood.—
Emily Temple,
Literary Hub,
26 May 2026
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Lürssen’s other recent launch was just a little longer (383-foot-long) than NAUSICAÄ with a completely different design aesthetic—the strikingly traditional styled Boardwalk.—
Bill Springer,
Forbes.com,
26 May 2026
Noun
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Notably, there was a 1% increase in students aged 18 to 24 — the shrinking, traditional college-going age.—
Elizabeth Hernandez,
Denver Post,
31 May 2026
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In Space This Week in Space covers the new space age.—
Space.com Staff,
Space.com,
30 May 2026
Noun
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And here’s Prince William talking about the Kennedy moon shot.—
Stephen Schaefer,
Boston Herald,
31 May 2026
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Closer to the modern era, an Inuit creation story relays a chase scene to explain the sun and moon's asynchronous flights.—
Doris Elin Urrutia,
Space.com,
30 May 2026
Cite this Entry
“Blue moon.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/blue%20moon. Accessed 5 Jun. 2026.
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