"focus" Definition

Definitions for the word "focus" from multiple English dictionaries.

1. n.
A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror.
Source: The 1913 Webster Unabridged Dictionary, 1913
2. n.
A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant.
Source: The 1913 Webster Unabridged Dictionary, 1913
3. n.
A central point; a point of concentration.
Source: The 1913 Webster Unabridged Dictionary, 1913
4. v. t.
To bring to a focus; to focalize; as, to focus a camera.
Source: The 1913 Webster Unabridged Dictionary, 1913
5. n.
(pl. Focuses or foci) 1 a point at which rays or waves meet after reflection or refraction. B point from which rays etc. Appear to proceed. 2 a point at which an object must be situated for a lens or mirror to give a well-defined image. B adjustment of the eye or a lens to give a clear image. C state of clear definition (out of focus). 3 = *focal point 2. v. (-s- or -ss-) 1 bring into focus. 2 adjust the focus of (a lens or eye). 3 concentrate or be concentrated on. 4 converge or make converge to a focus. [latin, = hearth]
Source: Oxford English Dictionary, 1884

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Additional Info
This page provides a list of definitions and meanings for "focus" from various historical English dictionaries. By displaying multiple definitions, you can compare and contrast different meanings and nuances of a word, phrase, or slang. You can also see the changes in meaning of "focus" over time by viewing the definitions from different dictionaries published at different times in history. The page also includes other information to help users expand their vocabulary and understand the context of the word.

Important Notes
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