Sea of Tranquility

proper noun

A basin in Nearside, Moon, Earth, Solar System; location of the first manned moon landing, in 1969.

Similar
Mare Tranquillitatis
OriginLatin Mare Tranquilitātis →
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Meanings

proper nounthe Sea of Tranquility

alternative Sea of Tranquillity

  1. astronomyA basin in Nearside, Moon, Earth, Solar System; location of the first manned moon landing, in 1969.

    Synonyms: Mare Tranquillitatis

Synonyms & antonyms

proper nounA basin in Nearside, Moon, Earth, Solar System; location of the first manned moon landing, in 1969.

Similar
Mare Tranquillitatis

Origin

  1. LatinMare Tranquilitātis
  2. EnglishSea of Tranquility

Calque of Latin Mare Tranquilitātis (spelled with one L), from Latin mare (“sea”)+tranquilitātis (“tranquility”). Coined by Italian Jesuit astronomer Giovanni Battista Riccioli, by labelling a map created by Italian Jesuit optician Francesco Maria Grimaldi, and then published in 1651 in the Almagestum Novum.

More words from Latin

Full word history & related roots →

Translations

Finnish Rauhallisuuden meri
  • Rauhallisuuden meriTranslations
French Mer de la Tranquillité
  • Mer de la TranquillitéTranslations
German Meer der Ruhe
  • Meer der RuheTranslations
Italian Mare della Tranquillità
  • Mare della TranquillitàTranslations
Latin Mare Tranquillitātis
  • Mare TranquillitātisTranslations
Portuguese Mar da Tranquilidade
  • Mar da TranquilidadeTranslations
Cite this entry
APA

Sea of Tranquility. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Sea%20of%20Tranquility

MLA

“Sea of Tranquility.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Sea%20of%20Tranquility. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “Sea of Tranquility,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Sea%20of%20Tranquility.

Source: Sea of Tranquility on Wiktionary, CC BY-SA 4.0.