su·​per·​moon ˈsü-pər-ˌmün How to pronounce supermoon (audio)
plural supermoons
: a full moon occurring when the moon is at or near the closest point in its orbit
A supermoon … occurs when the moon is full within 24 hours of being at its closest point to the Earth in its orbit.Kaleigh Rogers
Visible supermoons appear 14% bigger and 30% brighter than full moons that occur at the farthest point in the moon's orbit.Karen Hao
As the first and only supermoon of 2017 rose high into the sky this Sunday (Dec. 3), astrophotographers seized the opportunity to shoot the moon in all its bigger-than-usual glory.Hanneke Weitering

Examples of supermoon in a Sentence

Recent Examples on the Web Super Blue Blood Moon: This is an extremely rare event in which a supermoon (when the moon is at its closest point to Earth), a blue moon and a total lunar eclipse all occur simultaneously. Tiffany Acosta, The Arizona Republic, 22 Apr. 2024 When the moon’s orbit brings it closer to Earth than usual, the cosmic combo is called a supermoon. Carlie Procell, The Courier-Journal, 25 Jan. 2024 Definitions of a supermoon can vary, but the term generally denotes a full moon that is closer to Earth than normal and thus appears larger and brighter in the night sky. Taylor Nicioli, CNN, 24 Mar. 2024 The super blue moon on August 30 will be the closest of all the full supermoons this year at only 222,043 miles away, according to The Old Farmer's Almanac, versus the average 238,855 miles. Terri Robertson, Country Living, 28 Aug. 2023 The first of two supermoons this month rising above Madrid. Joseph De Avila, WSJ, 1 Aug. 2023 In honor of the total solar eclipse on Friday, April 8 and the upcoming supermoon on Monday, August 19, Jeni’s Splendid Ice Creams is celebrating 2024’s celestial events with a debut otherworldly collection of ice cream flavors. Melissa Kravitz Hoeffner, Forbes, 27 Mar. 2024 More full moons this year Of the 12 full moons in 2024, the September and October lunar events will be considered supermoons, according to EarthSky. Taylor Nicioli, CNN, 24 Mar. 2024 Full Blue Supermoon August will close the month with a grand finale: a full blue supermoon. Stephanie Vermillion, Travel + Leisure, 1 Aug. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'supermoon.' 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

1979, in the meaning defined above

Time Traveler
The first known use of supermoon was in 1979

Dictionary Entries Near supermoon

Cite this Entry

“Supermoon.” Dictionary, Merriam-Webster, Accessed 18 Jun. 2024.

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!