/ pəˈrɪfərəl; NAmE / adjective , noun
■ adjective
1.
peripheral (to sth) ( formal ) not as important as the main aim, part, etc. of sth :
peripheral information
Fund-raising is peripheral to their main activities.
2.
( technical ) connected with the outer edge of a particular area :
the peripheral nervous system
peripheral vision
3.
( computing ) ( of equipment ) connected to a computer :
a peripheral device
► per·iph·er·al·ly / pəˈrɪfərəli; NAmE / adverb
■ noun
( computing ) a piece of equipment that is connected to a computer :
monitors, printers and other peripherals