- The definition of a focus is the central point of attention.
An example of focus is a newborn baby in a family.
- Focus is defined as to concentrate on something in particular.Focus is defined as to bring into view.
- An example of focus is to put all of one's energy into a science project.
- An example of focus is to adjust a microscope to better see a specimen.
This baby is the focus of her parents attention.
nounpl. focuses or foci
- the point where rays of light, heat, etc. or waves of sound come together, or from which they spread or seem to spread; specif., the point where rays of light reflected by a mirror or refracted by a lens meet (called real focus) or the point where they would meet if prolonged backward through the lens or mirror (called virtual focus)
- focal length
- an adjustment of the focal length to make a clear image: to bring a camera into focus
- any center of activity, attention, etc.
- a part of the body where a disease process, as an infection, tumor, etc., is localized or most active
- the starting point of an earthquake
- either of the two fixed points used in determining an ellipse
- any analogous point for a parabola or hyperbola
Origin of focusModern Latin adopted in math. senses by Johannes Kepler (1604) ; from Classical Latin fireplace, hearth ; from uncertain or unknown; perhaps Indo-European base an unverified form bhok-, to flame, burn from source uncertain or unknown; perhaps Armenian bo, flame
transitive verbfocused or focussed, focusing or focussing
- to bring into focus
- to adjust the focal length of (the eye, a lens, etc.) in order to produce a clear image
- to fix or settle on one thing; concentrate: to focus one's attention on a question
- to meet at a focus
- to adjust one's eye or a lens so as to make a clear image
- to direct one's thoughts or efforts; concentrate
out of focus
nounpl. fo·cus·es or fo·ci
- a. The distinctness or clarity of an image rendered by an optical system.b. The state of maximum distinctness or clarity of such an image: in focus; out of focus.c. 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. 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. Also called focal point.b. See focal length.
- a. A center of interest or activity: “Precisely how diet affects E. coli in livestock is the focus of current research” (Cindy Engel).b. 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).c. A condition in which something can be clearly apprehended or perceived: couldn't get the problem into focus.
- Medicine The region of a localized bodily infection or disease.
- Geology The point of origin of an earthquake.
- Mathematics A fixed point whose relationship with a directrix determines a conic section.
verbfo·cused, fo·cus·ing, fo·cus·es or fo·cussed or fo·cus·sing or fo·cus·ses
- To cause (light rays, for example) to converge on or toward a central point; concentrate.
- a. 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.b. 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.
Origin of focusNew Latin, from Latin, hearth (probably in reference to the fact that a lens or parabolic mirror can concentrate sunlight on a single point to start a fire).
(countable and uncountable, plural foci or focuses)
- (countable, optics) A point at which reflected or refracted rays of light converge.
- The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.
- (countable, geometry) A point of a conic at which rays reflected from a curve or surface converge.
- (uncountable, photography, cinematography) The fact of the convergence of light on the photographic medium.
- Unfortunately, the license plate is out of focus in this image.
- (uncountable, photography, cinematography) The quality of the convergence of light on the photographic medium.
- During this scene, the boy’s face shifts subtly from soft focus into sharp focus.
- (uncountable) Concentration of attention.
- I believe I can bring the high degree of focus required for this important job.
- (countable, seismology) The exact point of where an earthquake occurs, in three dimensions.
- The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.
- (computing, graphical user interface) The indicator of the currently active element in a user interface.
- Text entered at the keyboard or pasted from a clipboard is sent to the component which currently has the focus.
- (linguistics) The most important word or phrase in a sentence or passage, or the one that imparts information.
(third-person singular simple present focuses or, less commonly, focusses, present participle focusing or, less commonly, focussing, simple past and past participle focused or, less commonly, focussed)
- To cause (rays of light, etc) to converge at a single point.
- To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
- You'll need to focus the microscope carefully in order to capture the full detail of this surface.
- (followed by on or upon) To concentrate one's attention.
- Focus on passing the test.
- (intransitive) To concentrate one’s attention.
- If you're going to beat your competitors, you need to focus.
The spellings focusses, focussing, focussed are observed in Commonwealth English while the spellings focuses, focusing, focused are preferred in the US.
Latin focus (“hearth, fireplace”), of unknown origin. Usually connected with Old Armenian բոց (bocʿ).
focus - Computer Definition
(1) A DBMS from Information Builders that runs on more than 35 different platforms. FOCUS has been widely known for its 4GL and report writing capabilities and is the product that built the company. It included a hierarchical database in its first release in 1975 and has evolved to support more than 80 database and file types including Information Builders' own multidimensional database (FOCUS Fusion). See EDA, WebFOCUS and FOCUS Fusion.
(2) (Federation On Computing in the United States, www.acm.org/focus) The U.S. representative of the International Federation for Information Processing (IFIP), www.ifip.or.at. FOCUS was founded in 1991 by the ACM and the IEEE Computer Society (IEEE-CS).
(3) (focus) In software, the current window, menu or dialog box that is affected by a key stroke or mouse movement. For example, after you click from one window to another, the second one is said "to have the focus."