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French word lundi comes from Latin dies, Proto-Indo-European *lewk-, and later Proto-Indo-European *lówksneh₂ (Moon.)
dies (Latin)
(often in the feminine) A set day: a date, an appointment.. A day, particularly:. A solar or sidereal day of about 24 hours, especially (historical) Roman dates reckoned from one midnight to the next.. Daytime: a period of light between sunrise and sunset.
*lewk- (Proto-Indo-European)
*lowksneh₂ (Proto-Indo-European)
*lewksnā (Proto-Indo-European)
*lówksneh₂ (Proto-Indo-European)
Moon.
*louksnā (Proto-Italic)
losna (Old Latin)
luna (Latin)
(figuratively) a month. (figuratively) a night. A crescent shape. The Moon.
dies Lunae (Latin)
Monday.
*Lunae dies (Vulgar Latin)
lundi (Old French)
Monday.
lundi (French)
Monday.