1393, from Anglo-Fr.
clyent, from L.
cliens (acc.
clientem) "follower, retainer," perhaps a var. of prp. of
cluere "listen, follow, obey" (see
listen); or from
clinare "to incline, bend," from suffixed form of PIE base
*klei- "to lean" (see
lean (v.)). The ground sense is of one who leans on another for protection. In ancient Rome, a plebian under protection of a patrician (in this relationship called
patronus, see
patron), originally in Eng. "a lawyer's customer," by c.1600 extended to any customer.
Clientele is 1563, from Fr.
clientèle, from L.
clientela "relationship between dependent and patron."