focus
1. fo.cus \'fo--k*s\ \-.si-\ n or fo.cus.es or fo.ci [NL, fr. L, hearth] pl
1: a point at which rays converge or from which they diverge or appear to
d iverge; specif : the point where the geometrical lines or their
prolongations conforming to the rays diverging from or converging toward
another point intersect and give rise to an image after reflection by a
mirror or refraction by a lens or optical system 2a: FOCAL LENGTH 2b:
adjustment for distinct vision; also : the area that may be see n
distinctly or resolved into a clear image 3: one of the points that with
the corresponding directrix defines a conic section 4: a localized area of
disease or the chief site of a generalized disease o r infection 5: a
center of activity, attraction, or attention 6: the place of origin of an
earthquake : having or giving the proper sharpness of outline due to good
focusing : not in focus - in focus
2. focus vb or fo.cused also fo.cussed; also fo.cus.ing; also fo.cus.sing
1: to bring to a focus : CONCENTRATE 2: to cause to be concentrated 3a:
to adjust the focus of 3b: to bring into focus 1: to come to a focus :
CONVERGE 2: to adjust one's eye or a camera to a particular range