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Latin word vesper comes from Proto-Indo-European *wekʷsp-, and later Proto-Indo-European *wek(ʷ)speros (Evening.)
*wekʷsp- (Proto-Indo-European)
*wek(ʷ)speros (Proto-Indo-European)
Evening.
vesper (Latin)
(by extension) the West. (by extension) the evening star. Supper, dinner (evening meal). The evening or vespers.