1. • noun - the concentration of attention or energy on something
   • noun - maximum clarity or distinctness of an image rendered by an optical system
   • noun - maximum clarity or distinctness of an idea
   • noun - a central point or locus of an infection in an organism
   • noun - special emphasis attached to something
   • noun - a point of convergence of light (or other radiation) or a point from which it diverges
   • noun - a fixed reference point on the concave side of a conic section
   • verb - direct one's attention on something
   • verb - cause to converge on or toward a central point
   • verb - bring into focus or alignment
   • verb - become focussed or come into focus
   • verb - put (an image) into focus
2. • A point at which rays of light or other radiation converge or from which they appear to diverge, as after refraction or reflection in an optical system: the focus of a lens.
   • See focal length.
   • The distinctness or clarity of an image rendered by an optical system.
   • The state of maximum distinctness or clarity of such an image: in focus; out of focus.
   • An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear: a camera with automatic focus.
   • A center of interest or activity.
   • Close or narrow attention; concentration: “He was forever taken aback by [New York’s] pervasive atmosphere of purposefulness—the tight focus of its drivers, the brisk intensity of its pedestrians” (Anne Tyler).
   • A condition in which something can be clearly apprehended or perceived: couldn’t get the problem into focus.
   • The region of a localized bodily infection or disease.
   • Geology.
   • A fixed point whose relationship with a directrix determines a conic section.
   • To cause (light rays, for example) to converge on or toward a central point; concentrate.
   • To render (an object or image) in clear outline or sharp detail by adjustment of one’s vision or an optical device; bring into focus.
   • To adjust (a lens, for example) to produce a clear image.
   • To direct toward a particular point or purpose: focused all their attention on finding a solution to the problem.
   • To converge on or toward a central point of focus; be focused.
   • To adjust one’s vision or an optical device so as to render a clear, distinct image.
   • To concentrate attention or energy: a campaign that focused on economic issues.
3. • n - a point at which rays converge or from which they diverge
   • v - to bring to a focus

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