All 6 Uses of

focus
in
A Great and Terrible Beauty

The whole room spins out of focus and comes back.†
Chpt 19 *

out of focus = in a state where something cannot be seen clearly

Ann stares at the cup, grateful for something to focus on.†
Chpt 26 *

focus = concentrate

My room comes into focus by degrees—the ceiling, the gray light at the window, the worn wooden floor.†
Chpt 28

focus = a state where something has come into view or can be seen clearly

When she reaches the left side of the grand room, she opens her eyes and focuses on a heavyset man in the second row.†
Chpt 21

Definitions:

(1) (focus as in: Turn your focus to question #2.)
verb: to concentrate, look at, or pay attention to

noun: the act of concentration, or the ability to concentrate

(to concentrate is to direct attention or effort towards a single thing)
(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.