Plural of moon; natural satellites that orbit planets, or a poetic way to describe months or long periods of time.
From Old English 'mona,' related to Old Norse 'máni' and Sanskrit 'mas' (month). The word is ancient, shared across Indo-European languages, because humans have always tracked the moon.
The moon and the month come from the same root word because people originally used moon cycles to count time. Our word 'month' is literally 'moon-th'—and 'menstrual' comes from the same root because of the monthly cycle's connection to lunar months.
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