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focus2 W2
1 [singular] the thing, person, situation etc that people pay special attention to COLLOCATIONS 
the focus is on something the focus of attention/concern/interest the focus of debate the main/central/primary focus (of something) become the focus (of/for something) provide a focus (for something) shift the focus (of something) the focus shifts (from something) (to something)

the focus is on something the focus of attention/concern/interest the focus of debate the main/central/primary focus (of something) become the focus (of/for something) provide a focus (for something) shift the focus (of something) the focus shifts (from something) (to something)
2 [uncountable] if your focus is on something, that is the thing you are giving most attention to
3 if something comes into focus, or you bring it into focus, people start to talk about it and pay attention to it :
come into focus/bring something into focus
4 if a photograph or an instrument such as a camera is in focus, you can see the picture clearly. If it is out of focus, you cannot see the picture clearly.
in focus/out of focus
HPO5 [uncountable] the clearness of the picture seen through an instrument such as a camera :
He raised his binoculars and adjusted the focus.
He raised his binoculars and adjusted the focus.