Student Dictionary

2 entries found for focus.
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Main Entry: 1fo·cus
Pronunciation: primarystressfomacr-kschwas
Function: noun
Inflected Form(s): plural fo·ci /-secondarystresssimacr /; also fo·cus·es
1 : a point at which rays (as of light, heat, or sound) meet or from which they draw apart or appear to draw apart; especially : the point at which an image is formed by a mirror, lens, or optical system
2 a : FOCAL LENGTH b : adjustment (as of the eye or binoculars) for clear vision <bring into focus>
3 : one of the two points within an ellipse the sum of whose distances from any point on the ellipse is a constant number
4 : a center of activity or interest
5 : the starting point of an earthquake

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