1. a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts.
2. Physics . [ a point at which rays of light, heat, or other radiation, meet after being refracted or reflected.
3. Optics .
a. the focal point of a lens.
b. the focal length of a lens.
c. the clear and sharply defined condition of an image.
the position of a viewed object or the adjustment of an optical device necessary to produce a clear image: in focus; out of focus.
4. Geometry . (of a conic section) a point having the property that the distances from any point on a curve to it and to a fixed line have a constant ratio for all points on the curve.
5. Geology . the point of origin of an earthquake.
6. Pathology . the primary center from which a disease develops or in which it localizes.
–verb (used with object)
7. to bring to a focus or into focus: to focus the lens of a camera.
8. to concentrate: to focus one's thoughts.
–verb (used without object)
9. to become focused.
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