focus

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focus[1,noun] focus[2,verb] real focus virtual focus

Main Entry: ¹fo·cus
Pronunciation: f-ks
Function: noun
Inflected Form(s): plural fo·ci /f-s also -k /; also fo·cus·es
1 a : a point at which rays (as of light, heat, or sound) converge or from which they diverge or appear to diverge; specifically : the point where the geometrical lines or their prolongations conforming to the rays diverging from or converging toward another point intersect and give rise to an image after reflection by a mirror or refraction by a lens or optical system b : a point of convergence of a beam of particles (as electrons)
2 a : FOCAL LENGTH b : adjustment for distinct vision; also : the area that may be seen distinctly or resolved into a clear image
3 : a localized area of disease or the chief site of a generalized disease or infection