related to the key issue but not of central importance; "a peripheral interest"; "energy is far from a peripheral issue in the economy"; "peripheral issues"
(computer science) electronic equipment connected by cable to the CPU of a computer; "disk drives and printers are important peripherals" (同)computer peripheral, peripheral device
on or near an edge or constituting an outer boundary; the outer area; "Russias peripheral provinces"; "peripheral suburbs"
in or at or near a periphery or according to a peripheral role or function or relationship