A state of peacefulness and calm, without noise, worry, or disturbance.
It comes from Latin 'tranquillitas', from 'tranquillus' meaning 'calm' or 'still', especially of the sea or weather. It entered English through French in the Middle Ages.
The Sea of Tranquility is the place on the Moon where humans first landed, as if we chose 'calm' as our first address off Earth. Tranquility isn’t just the absence of noise—it’s the feeling that nothing urgent is pulling at you.
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