Definition of Focus

Noun: focus (foci,focuses) fow-kus

The concentration of attention or energy on something
"the focus of activity shifted to molecular biology";
- focusing, focussing, focal point, direction, centering [US], centreing [Brit, Cdn], centring [Brit, Cdn]
Maximum clarity or distinctness of an image rendered by an optical system
"in focus"; "out of focus"
Maximum clarity or distinctness of an idea
"the controversy brought clearly into focus an important difference of opinion"
A central point or locus of an infection in an organism
"the focus of infection";
- focal point, nidus
Special emphasis attached to something
"the focus was more on accuracy than on speed";
- stress
A point of convergence of light (or other radiation) or a point from which it diverges
- focal point
A fixed reference point on the concave side of a conic section
(computing) the active element in a user interface, typically where user input will appear on screen
"when you click a text box, it gets the input focus"

Verb: focus (focused,focusing,focuses, also focussed,focussing,focusses) fow-kus

Direct one's attention on something
"Please focus on your studies and not on your hobbies";
- concentrate, center [US], centre [Brit, Cdn], pore, rivet
Cause to converge on or toward a central point
"Focus the light on this image"
Bring into focus or alignment; to converge or cause to converge; of ideas or emotions
- concenter [US], concentre [Brit, Cdn], focalize, focalise [Brit]
Become focussed or come into focus
"The light focused";
- focalize, focalise [Brit]
Put (an image) into focus
"Please focus the image; we cannot enjoy the movie";
- focalize, focalise [Brit], sharpen