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English definition of “focus”

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focus

noun [C] uk   /ˈfəʊ.kəs/ us    /ˈfoʊ-/ ( plural focuses or formal foci )

focus noun [C] (CENTRE)

C1 the main or central point of something, especially of attention or interest: I think Dave likes to be the focus of attention. The main focus of interest at the fashion show was Christian Lacroix's outrageous evening wear. The media focus on politicians' private lives inevitably switches the attention away from the real issues.
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focus noun [C] (SCIENCE)

(in physics) the point where waves of light or sound that are moving towards each other meet: the focus of a lensbe in/out of focus used to say that a photograph is clear/not clear

focus

verb uk   /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. [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).
Phrasal verbs
(Definition of focus from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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