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focus (n.)

1640s, "point of convergence," from Latin focus "hearth, fireplace" (also, figuratively, "home, family"), which is of unknown origin. Used in post-classical times for "fire" itself; taken by Kepler (1604) in a mathematical sense for "point of convergence," perhaps on analogy of the burning point of a lens (the purely optical sense of the word may have existed before Kepler, but it is not recorded). Introduced into English 1650s by Hobbes. Sense transfer to "center of activity or energy" is first recorded 1796.

focus (v.)

1775 in optics, "bring into focus" (transitive); 1807 in the figurative sense, from focus (n.). Intransitive use by 1864, originally in photography. Related: Focused; focusing; less commonly focussed; focussing.

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Definitions of focus
1
focus (n.)
the concentration of attention or energy on something;
the focus of activity shifted to molecular biology
Synonyms: focusing / focussing / focal point / direction / centering
focus (n.)
maximum clarity or distinctness of an image rendered by an optical system;
out of focus
in focus
focus (n.)
maximum clarity or distinctness of an idea;
the controversy brought clearly into focus an important difference of opinion
focus (n.)
a central point or locus of an infection in an organism;
the focus of infection
Synonyms: focal point / nidus
focus (n.)
special emphasis attached to something;
Synonyms: stress
focus (n.)
a point of convergence of light (or other radiation) or a point from which it diverges;
Synonyms: focal point
focus (n.)
a fixed reference point on the concave side of a conic section;
2
focus (v.)
direct one's attention on something;
Please focus on your studies and not on your hobbies
Synonyms: concentrate / center / centre / pore / rivet
focus (v.)
cause to converge on or toward a central point;
focus (v.)
bring into focus or alignment; to converge or cause to converge; of ideas or emotions;
Synonyms: concenter / concentre / focalize / focalise
focus (v.)
become focussed or come into focus;
The light focused
Synonyms: focalize / focalise
focus (v.)
put (an image) into focus; "Please focus the image; we cannot enjoy the movie";
Synonyms: focalize / focalise / sharpen
From wordnet.princeton.edu