concentrate
1. con.cen.trate \'ka:n(t)-s*n-.tra-t, -.sen-\ \-.tra-t-*r\ vb [com- + L
centrum center] 1a: to bring or direct toward a common center or objective
1b: to gather into one body, mass, or force 2a: to make less dilute {~
syrup} 2b: to express or exhibit in condensed form 1: to draw toward or
meet in a common center 2: GATHER, COLLECT 3: to concentrate one's
powers, efforts, or attentions {~ on a pro blem} - con.cen.tra.tor n
2. concentrate n : something concentrated
Webster's English Dictionary