the concentration of attention or energy on something; "the focus of activity shifted to molecular biology" "he had no direction in his life"
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"
special emphasis attached to something; "the stress was more on accuracy than on speed"
a point of convergence of light (or other radiation) or a point from which it divergesa fixed reference point on the concave side of a conic section