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focus (n.)

1640年代, “汇合点”, 来自拉丁文 focus “炉膛, 火炉” (也可形象地说是“家, 家庭” ), 来源不明. 在后古典时代用于“火” 本身; 被开普勒(1604年) 在数学意义上取为“会聚点”, 也许是类比透镜的燃烧点(这个词的纯光学意义可能在开普勒之前就已经存在, 但没有记载). 1650年代由霍布斯引入英语. 1796年首次记录了“活动或能量中心” 的感觉转移.

focus (v.)

1775年在光学中, “使之成为焦点” (转义); 1807年在具象意义上, 来自 focus (n.). 到1864年的不定性使用, 最初用于摄影. 相关: Focused; focusing; 较少见的是 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