The word 'vespers' has its origins in the Latin 'vesper', which itself derives from the Greek 'hesperos', both meaning "evening" or the "evening star" (Venus). This connection to the fading light of day led to its adoption in Ecclesiastical Latin for the canonical hour of evening prayer. The term entered English via Old French 'vespre', solidifying its specific religious meaning as the sixth of the seven canonical hours, a service traditionally held at twilight. Thus, the word's journey reflects a direct conceptual link from an astronomical phenomenon to a designated time for worship.

Structure: vesper (evening) + s (plural suffix) 'vesper' is from Latin 'vesper', meaning "evening" or "evening star". The '-s' is a common English plural suffix.