Definition of "Focus" :

noun: maximum clarity or distinctness of an image rendered by an optical system

"In focus."

noun: maximum clarity or distinctness of an idea

"The controversy brought clearly into focus an important difference of opinion."

noun: the concentration of attention or energy on something

"The focus of activity shifted to molecular biology."

noun: a fixed reference point on the concave side of a conic section

noun: a point of convergence of light (or other radiation) or a point from which it diverges

noun: a central point or locus of an infection in an organism

"The focus of infection."

noun: special emphasis attached to something

verb: put (an image) into focus

"Please focus the image; we cannot enjoy the movie."

verb: become focussed or come into focus

"The light focused."

verb: direct one's attention on something

"Please focus on your studies and not on your hobbies."

verb: bring into focus or alignment; to converge or cause to converge; of ideas or emotions

verb: cause to converge on or toward a central point

"Focus the light on this image."