focus - noun

the concentration of attention or energy on something

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

maximum clarity or distinctness of an idea

a central point or locus of an infection in an organism

special emphasis attached to something

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

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

focus - verb

• direct one's attention on something
• cause to converge on or toward a central point
• bring into focus or alignment; to converge or cause to converge; of ideas or emotions
• become focussed or come into focus
• put (an image) into focus

focus - thesaurus

center   centering   centre   concenter   concentrate   concentre   direction   focalise   focalize   focusing   focussing   nidus   pore   rivet   sharpen   stress