MSL

M3S1L1

A form of mean sea level — The mean altitude of the ocean surface, averaged over all high and low tides at a particular location.

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Meanings

nounMSL (uncountable)
  1. abbreviationinitialismuncountableaeronauticsInitialism of mean sea level.

    The company shard specific data from today’s flight on social media, revealing that the New Shepard capsule that carried Katy Perry, Gayle King and their crewmates to space hit 346,802 feet above ground level (AGL) and 350,449 above mean sea level (MSL).

    2025 April 14, Jackie Wattles, Ashley Strickland and Taylor Nicioli, “Blue Origin launches star-studded crew on space tourism rocket”, in CNN
  2. abbreviationinitialismuncountablegovernmentInitialism of maritime/marine security, large; a type of cutter or (sovereignty, freedom-of-navigation, surveillance/reconnaissance) patrol vessel/craft/boat/ship.
proper noun
  1. USabbreviationinitialismspace; US space program; space; US space programInitialism of Mars Science Laboratory.

Synonyms & antonyms

Also see
maritime sign languagemean sea levelsea level

Origin

Abbreviation.

Full word history & related roots →
Cite this entry
APA

MSL. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/MSL

MLA

“MSL.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/MSL. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “MSL,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/MSL.

Source: MSL on Wiktionary, CC BY-SA 4.0.