Longman Dictionary of Contemporary English homepage

Topic: OPTICS

Date: 1600-1700
Language: Latin
Origin: 'hearth (= place for a fire in a house)'

focus

1 verb
     
fo‧cus1 W2 past tense and past participle focused or focussed, present participle focusing or focussing
1

give attention to something

[intransitive and transitive] to give special attention to one particular person or thing, or to make people do this
focus on
He needs to focus more on his career.
focus your attention/mind/efforts on something
She tried to focus her mind on her work.
focus (somebody's) mind/attention (on something) (=make people give their attention to something)
We need to focus public attention on this issue.
2

camera/telescope

[intransitive and transitive]HPO to point a camera or telescope at something, and change the controls slightly so that you can see that thing clearly
focus on
She turned the camera and focussed on Martin's face.
focus something on something
He focused his binoculars on the building opposite.
3

eyes

[intransitive and transitive]HPO if your eyes focus, or if you focus your eyes, you look at something and can see it clearly
focus on
All eyes focussed on her.
His eyes were focussed straight ahead.
4

light

[transitive]HPO if you focus beams of light, you aim them onto a particular place
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