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English definition of “peripheral”

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peripheral

adjective  /pəˈrɪf·ər·əl/ us  
not central or of main importance: First of all, we had to find out who the thief was – getting the money back was a peripheral issue. Peripheral vision is what you can see to the sides of what you are looking at.

peripheral

noun [C]  /pəˈrɪf·ər·əl/ us  
a piece of equipment, such as a printer, that can be connected to a computer
(Definition of peripheral from the Cambridge Academic Content Dictionary © Cambridge University Press)
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