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WordReference Random House Learner's Dictionary of American English © 2024fo•cus /ˈfoʊkəs/USA pronunciation n., pl. -cus•es, -ci /-saɪ, -kaɪ/USA pronunciation v., -cused, -cus•ing or (esp. Brit.) -cussed, -cus•sing.
n. - a central point, such as of attraction, attention, or activity:[countable]His focus was on earning a living.
- Physics[countable] a point at which rays of light, heat, or other radiation meet after being refracted or reflected.
- Optics the adjustment of an optical device that is necessary to produce a clear image:[uncountable]The image is in focus.
v. - to (cause to) come to a focus or into focus: [~ + object]to focus the lens of a camera.[no object]For a few moments my eyes wouldn't focus.
- to concentrate: [~ + object]I tried to focus my thoughts.[no object* (~ + on + object)]I tried to focus on the project.
WordReference Random House Unabridged Dictionary of American English © 2024fo•cus (fō′kəs),USA pronunciation n., pl. -cus•es, -ci (-sī, -kī),USA pronunciation v., -cused, -cus•ing or (esp. Brit.) -cussed, -cus•sing.
n. - a central point, as of attraction, attention, or activity:The need to prevent a nuclear war became the focus of all diplomatic efforts.
- Physicsa point at which rays of light, heat, or other radiation, meet after being refracted or reflected.
- Optics
- the focal point of a lens.
- the focal length of a lens.
- 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.
- Mathematics[Geom.](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. See diag. under ellipse, hyperbola, parabola.
- Geologythe point of origin of an earthquake.
- [Pathol.]the primary center from which a disease develops or in which it localizes.
v.t. - to bring to a focus or into focus:to focus the lens of a camera.
- to concentrate:to focus one's thoughts.
v.i. - to become focused.
- Latin: fireplace, hearth
- 1635–45
- 1.See corresponding entry in Unabridged center, heart, core, nucleus.
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