lunation

noun

lu·​na·​tion lü-ˈnā-shən How to pronounce lunation (audio)
: the period of time averaging 29 days, 12 hours, 44 minutes, and 2.8 seconds elapsing between two successive new moons

Examples of lunation in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
On July 24th, the day of the lunation, Saturn retrograded in Aries, Neptune retrograded in Aries, Uranus in Gemini, and Pluto retrograde in Aquarius, are in aspect with the New Moon. Lisa Stardust, Refinery29, 21 July 2025 In comparison to the bright fireworks that lit up the night sky at the start of the month, the upcoming lunation will result in the opposite: darkness. Skyler Caruso, People.com, 19 July 2025 Don’t hold yourself back from excellent opportunities manifesting under this lunation. Lisa Stardust, Vogue, 10 June 2025 This lunation is also known as the Thundermoon (from the many thunderstorms in July), Hay Moon (this is its peak harvest month), and Wyrt Moon (from an old Celtic word for herbs, as this is an ideal time to gather plants for drying). Lisa Stardust, refinery29.com, 8 July 2025 See All Example Sentences for lunation

Word History

Etymology

Middle English lunacioun, borrowed from Anglo-French & Latin; Anglo-French lunaison, lunaciun, borrowed from Medieval Latin lūnātiōn-, lūnātiō, from Latin lūna "moon" + -ātiōn-, -ātiō -ation — more at lunar

First Known Use

14th century, in the meaning defined above

Time Traveler
The first known use of lunation was in the 14th century

Browse Nearby Words

Cite this Entry

“Lunation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lunation. Accessed 29 Jul. 2025.

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!