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English definition of “peripheral”

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peripheral

adjective uk   /pəˈrɪf.ər.əl/ us    /-ˈrɪf.ɚ-/
Something that is peripheral is not as important as something else: The book contains a great deal of peripheral detail. happening at the edge of something: A figure came into my peripheral vision.

peripheral

noun [C] uk   /pəˈrɪf.ər.əl/ us    /-ˈrɪf.ɚ-/ specialized
a piece of equipment, such as a printer, that can be connected to a computer
(Definition of peripheral from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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