Focus definitions

fō'kəs
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)
noun
118
1
noun
115
2
An adjustment of the focal length to make a clear image.

To bring a camera into focus.

noun
111
3
Any center of activity, attention, etc.
noun
108
0
A part of the body where a disease process, as an infection, tumor, etc., is localized or most active.
noun
105
2
The starting point of an earthquake.
noun
103
1
To meet at a focus.
verb
99
2
To adjust one's eye or a lens so as to make a clear image.
verb
96
2
To direct one's thoughts or efforts; concentrate.
verb
93
2
To bring into focus.
verb
90
2
To adjust the focal length of (the eye, a lens, etc.) in order to produce a clear image.
verb
87
1
The region of a localized bodily infection or disease.
noun
85
2
To fix or settle on one thing; concentrate.

To focus one's attention on a question.

verb
84
3
The point of origin of an earthquake.
noun
82
1
A fixed point whose relationship with a directrix determines a conic section.
noun
79
2
To cause (light rays, for example) to converge on or toward a central point; concentrate.
verb
76
1
To direct toward a particular point or purpose.

Focused all their attention on finding a solution to the problem.

verb
73
2
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.
verb
70
2
To adjust (a lens, for example) to produce a clear image.
verb
67
1
To converge on or toward a central point of focus; be focused.
verb
64
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.
noun
61
2
The distinctness or clarity of an image rendered by an optical system.
noun
58
1
The state of maximum distinctness or clarity of such an image.
noun
55
1
The region of a localized bodily infection or disease.
noun
52
1
To cause light rays or other radiation to converge on or toward a central point; concentrate.
verb
49
0
To render an object or image in clear outline or sharp detail by adjustment of one's vision or an optical device.
verb
46
1
To adjust a lens or instrument to produce a clear image.
verb
43
1
To converge on or toward a central point of focus; be focused.
verb
40
0
The degree of clarity with which an eye or optical instrument produces an image.
25
0
A central point or region, such as the point at which an earthquake starts.
22
0
A fixed point or one of a pair of fixed points used in generating a curve such as an ellipse, parabola, or hyperbola.
19
0
The region of a localized bodily infection or disease.
16
0
The definition of a focus is the central point of attention.

An example of focus is a newborn baby in a family.

noun
15
0
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.

verb
12
0
(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.

noun
9
0
(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.

noun
9
0
(countable, geometry) A point of a conic at which rays reflected from a curve or surface converge.
noun
6
0
(uncountable) Concentration of attention.

I believe I can bring the high degree of focus required for this important job.

noun
6
0
(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.

noun
3
0
(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.

noun
3
0
The distinctness or clarity of an image rendered by an optical system.
noun
0
0
The state of maximum distinctness or clarity of such an image.

In focus; out of focus.

noun
0
0
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.

noun
0
0
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.

noun
0
0
A center of interest or activity.
noun
0
0
Close or narrow attention; concentration.
noun
0
0
A condition in which something can be clearly apprehended or perceived.

Couldn't get the problem into focus.

noun
0
0
To adjust one's vision or an optical device so as to render a clear, distinct image.
verb
0
0
To concentrate attention or energy.

A campaign that focused on economic issues.

verb
0
0
Either of the two fixed points used in determining an ellipse.
noun
0
0
Any analogous point for a parabola or hyperbola.
noun
0
0
(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.
0
0
(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.

noun
0
0
(linguistics) The most important word or phrase in a sentence or passage, or the one that imparts information.
noun
0
0
To cause (rays of light, etc) to converge at a single point.
verb
0
0
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.

verb
0
0
(followed by on or upon) To concentrate one's attention.

Focus on passing the test.

verb
0
0
(intransitive) To concentrate one’s attention.

If you're going to beat your competitors, you need to focus.

verb
0
0

Origin of focus

New 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)