Meaning of USER in English

I. ˈyüzə(r) noun

( -s )

Etymology: Middle English, from usen to use + -er

: one that uses ; specifically : a person who uses alcoholic beverages or narcotics

II. noun

( -s )

Etymology: back-formation from non-user (I)

: enjoyment of a right of use : a right to use resulting from long-continued use

claims to arms by user could be allowed only if they went back before 1530 — L.G.Pine

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.