All 6 Uses

focus
in
Tender is the Night
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However, with Rosemary's sudden success in pictures Mrs. Speers felt that it was time she were spiritually weaned; it would please rather than pain her if this somewhat bouncing, breathless and exigent idealism would focus on something except herself.†
Chpt 1.3 *

focus = concentrate, or look
Suddenly she came toward him, her youth vanishing as she passed inside the focus of his eyes and he had kissed her breathlessly as if she were any age at all.†
Chpt 1.15 *

focus = where attention is concentrated
Dick held the check poised; to focus the attention of Casasus upon it he looked toward Pierce's desk, holding the latter for a moment in a friendly eye-play conditioned by an old joke of three years before when Pierce had been involved with a Lithuanian countess.†
Chpt 1.20
But before she reached him in a sway of soul and body his attention focussed on something else: he went into the bedroom and toward the bathroom.†
Chpt 1.25

focussed = concentrated

unconventional spelling: Most English-speaking regions prefer to spell this focused.
As the story concluded Dohmler sat back in the focal armchair of the middle class and said to himself sharply, "Peasant!"†
Chpt 2.3
It was even detached; his eyes focussed upon her gradually as upon a chessman to be moved; in the same slow manner he caught her wrist and drew her near.†
Chpt 3.5

focussed = concentrated

unconventional spelling: Most English-speaking regions prefer to spell this focused.

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)