sea level

noun

: the level of the surface of the sea especially at its mean position midway between mean high and low water compare ground level sense 1a

Examples of sea level 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.
The case brought by eight Bonaire residents and backed by environmental group Greenpeace, sought to compel the government to better shield its citizens from the effects of increasing temperatures and rising sea levels and could set a precedent for similar legal challenges elsewhere. Mike Corder, Los Angeles Times, 28 Jan. 2026 Most commercial aircraft fly around 30,000 to 40,000 feet (9 to 12 km) above sea level, but the F-15 can maintain a much higher altitude. Julian Dossett, Space.com, 27 Jan. 2026 Reuters/Kevin Fogarty On climate change, Holz said atmospheric carbon dioxide and global sea levels have reached record highs. Alex Sundby, CBS News, 27 Jan. 2026 Blithewold, the historic waterfront estate in Bristol, is fighting to protect its gardens and collection of rare specimen trees and plants from around the world from the threats of sea level rise and warming temperatures. Kathleen Hill, The Providence Journal, 24 Jan. 2026 See All Example Sentences for sea level

Word History

First Known Use

1806, in the meaning defined above

Time Traveler
The first known use of sea level was in 1806

Browse Nearby Words

Cite this Entry

“Sea level.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sea%20level. Accessed 30 Jan. 2026.

Kids Definition

sea level

noun
: the height of the surface of the sea midway between the average high and low tides

More from Merriam-Webster on sea level

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!