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15th century, in the meaning defined at sense 1
Middle English, from Latin lunaris, from luna moon; akin to Latin lucēre to shine — more at light
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“Lunar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lunar. Accessed 25 Feb. 2021.
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See the full definition for lunar in the English Language Learners Dictionary
More from Merriam-Webster on lunar
Nglish: Translation of lunar for Spanish Speakers
Britannica English: Translation of lunar for Arabic Speakers
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