peripheral(noun) (computer science) electronic equipment connected by cable to the CPU of a computer; "disk drives and printers are important peripherals"
(adjective) on or near an edge or constituting an outer boundary; the outer area; "Russia's peripheral provinces"; "peripheral suburbs"
(adjective satellite) 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"
Source:
WordNet 2.0 Copyright 2003 by Princeton University. All rights reserved.
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