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1.
on or near an edge or constituting an outer boundary; the outer area
Russia's peripheral provinces
peripheral suburbs
2.
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
'peripheral' - used as a noun
3.
(computer science) electronic equipment connected by cable to the CPU of a computer
disk drives and printers are important peripherals
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