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English definition of “peripheral”

peripheral

adjective     /pəˈrɪf.ər.əl/ US  /-ˈrɪf.ɚ-/
describes something that is not as important as something else: The book contains a great deal of peripheral detail.Of little or less importance happening at the edge of something: A figure came into my peripheral vision.Edges and extremities of objectsSurfaces of objects
(Definition of peripheral adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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