F4O1C3U1S1
10 points
FOCUS is validvalid
a point at which rays converge or from which they diverge [n FOCI, FOCUSES] / to concentrate attention [v FOCUSED, FOCUSES, FOCUSING, FOCUSSED, FOCUSSES, FOCUSSING] : FOCUSABLE [adj], FOCUSER [n]
(Latin) a point in which rays converge [n FOCUSES or FOCI] / to bring or adjust to a point [v FOCUSED or FOCUSSED, FOCUSING or FOCUSSING, FOCUSES or FOCUSSES]