All 5 Uses

focus
in
Flipped, by Wendelin Van Draanen
(Auto-generated)

I caught my breath and managed to call down, "No problem!" then forced myself to concentrate on those blue and yellow stripes, to focus on them and only them as I shinnied up, up, up.†
p. 36.4
My focus had been strictly on bringing them into the world.†
p. 72.3
Darla's neck whipped around searching for the bee, and I straightened out my focus for the rest of the day.†
p. 124.4 *
I forced myself to focus on the conversation.†
p. 162.1
And even though I know he's a coward and a sneak and I should never speak to him again, I'm having trouble focusing on that.†
p. 200.5

Definitions:

(1) (focus as in: Turn your focus to question #2.)
to direct attention or effort toward a single thing; or the ability to do so without getting distracted
(2) (focus as in: The focus of our study is...)
where attention is concentrated or directed
(3) (focus as in: bring into focus; or out of focus)
a state where something has come into view or can be seen clearly; or an adjustment made to permit a clear view
(4) (focus as with technical usage)
technical usage typically involves some sense of center or concentration such as:
- physics — a point where things come together such as the point where light rays meet
- geometry — a fixed reference point (as of a parabola)
- geology — the point of origin of an earthquake
See a comprehensive dictionary for other less common meanings.
(5) (meaning too rare to warrant focus)