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Dictionary.com Unabridged (v 1.1)Cite This Source
fo·cus    Audio Help   [foh-kuhs] Pronunciation Key noun, plural -cus·es, -ci    Audio Help   [-sahy, -kahy] Pronunciation Key, verb, -cused, -cus·ing or (especially British) -cussed, -cus·sing.
–noun
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.
d.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.
[Origin: 1635–45; < L: fireplace, hearth]

—Related forms
fo·cus·a·ble, adjective
fo·cus·er, noun

—Synonyms 1. center, heart, core, nucleus.
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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