Definitions of focus

  1. To bring to a focus; to focalize; as, to focus a camera.
  2. To bring to a focus; pp. focussed.
  3. To adjust or bring to a focus; concentrate.
  4. bring into focus or alignment; to converge or cause to converge; of ideas or emotions
  5. put into focus; as of an image on a screen; " Please focus the image; we cannot enjoy the movie"
  6. Focusing.
  7. maximum clarity or distinctness of an image rendered by an optical system; " in focus"; " out of focus"
  8. maximum clarity or distinctness of an idea; " the controversy brought clearly into focus an important difference of opinion"
  9. a fixed reference point on the concave side of a conic section
  10. put ( an image) into focus; " Please focus the image; we cannot enjoy the movie"
  11. 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.
  12. 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.
  13. A central point; a point of concentration.
  14. The point where a system of rays of light or heat meet after being reflected or refracted; any central point.
  15. ( optics) A point in which the rays of light meet after reflection or refraction, and cause great heat; any central point; - pl. FOCUSES and FOCI.
  16. Point where rays meet; central point.
  17. A point of meeting of rays of light; any point of concentration.
  18. Geom. One of two points, as in an ellipse, the sum or difference of whose distances to any point of the curve is always the same.
  19. The point in which rays of light or heat meet; any central point.
  20. Focused.
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