'Tranquility' is Latin for 'completely at rest' — immortalized in the Moon's Sea of Tranquility.
The quality or state of being tranquil; calmness, peacefulness, and freedom from disturbance.
From Latin 'tranquillitātem' (quietness, stillness, calmness), from 'tranquillus' (quiet, calm, still), which may be a compound of 'trans-' (across, beyond) and a root related to 'quiēs' (rest, quiet), though this etymology is debated. If correct, 'tranquillus' would mean something like 'quiet all the way through' or 'completely at rest.' The word entered English
The Sea of Tranquility ('Mare Tranquillitatis') on the Moon — where humans first set foot on July 20, 1969 — gave the word 'tranquility' its most famous modern association. Neil Armstrong's report from the lunar surface began: 'Houston, Tranquility Base here. The Eagle has landed.' A Latin word
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