verb
definition
(followed by on or upon) To concentrate one's attention.
example
I have to focus on my work.
definition
To cause (rays of light, etc) to converge at a single point.
definition
To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
example
You'll need to focus the microscope carefully in order to capture the full detail of this surface.
definition
To concentrate one’s attention.
example
If you're going to beat your competitors, you need to focus.
definition
To transfer the input focus to (a visual element), so that it receives subsequent input.
example
The text box won't receive the user's keystrokes unless you explicitly focus it.