peripheral

Universal Words adjective, noun adjective 1 ~ (to sth) (formal) not as important as the main aim, part, etc. of sth: peripheral information * Fund-raising is peripheral to their main activities. * matters of peripheral concern 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 peripherally adverb: They were only peripherally involved in the affair. noun (computing) a piece of equipment that is connected to a computer: monitors, printers and other peripherals