definition of
focus

[1] #1 focus v. [concentrate, center, centre, pore, rivet] direct one's attention on something; "Please focus on your studies and not on your hobbies". wn

[2] #2 focus n. [focusing, focussing, focal point, direction, centering] the concentration of attention or energy on something; "the focus of activity shifted to molecular biology"; "he had no direction in his life". wn

[3] #3 focus v. cause to converge on or toward a central point; "Focus the light on this image". wn

[4] #4 focus n. maximum clarity or distinctness of an image rendered by an optical system; "in focus"; "out of focus". wn

[5] #5 focus n. maximum clarity or distinctness of an idea; "the controversy brought clearly into focus an important difference of opinion". wn