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English definition of “focus”

focus

verb     /ˈfəʊ.kəs/ US  /ˈfoʊ-/ (-s-)
[T] If you focus a device such as a camera or microscope , you move a device on the lens so that you can see a clear picture .Photography [I or T] If you focus your eyes , or if your eyes focus, you try to look directly at an object so that you can see it more clearly : When they first took the bandages off, she/her eyes couldn't focus properly (= she couldn't see clearly ).Using the eyesEyesight, glasses and lensesThe eye and surrounding areaPerceptive
(Definition of focus verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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