verb
to concentrate on something and pay particular attention to it
to turn a part on a camera, telescope, microscope, etc. until you can see something clearly
if your eyes focus, or if you focus your eyes, you look at something carefully until you can start to see it clearly
if a lens or mirror focuses rays of light, or if they focus, they meet at a particular point
noun
the thing that people are concentrating on or paying particular attention to
particular attention paid to something
the act of concentrating on a particular goal and not wasting time or energy on other things
the state of being able to be seen clearly
the part of a camera, telescope, microscope, etc. that you turn until you can see something clearly

See Also

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18.20 - Mind - the focus of Christianity
Aggregation
Assimilation
Concentration