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Definition of focus : 1. A central point; a point of concentration.
2. A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror.
3. A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant.
4. To bring to a focus; to focalize; as, to focus a camera.

Synonyms:

localise, aperture, nidus, density, commission, reflection, tenseness, filter, management, celluloid, instruction, boil down, eye, turn to, capture, charge, distinct, centering, concern yourself, concentre, fix, grand unified theory, identifiable, cartridge, mecca, root, waver, consideration, guidance, central, developer, specific gravity, focalise, manifest, centralise, sit up and take notice, counseling, show up, apparent, digest, pap, soul-searching, concenter, sticking point, focal length, base, magnetic field, center of attention, centre, cynosure, accent, locus, focussing, focalization, see, bend, darkroom, reflect, introspection, shut, squeeze, adjust, nerve center, develop, focalisation, axis, stress, decoct, tension, substance, screw up, focus on, revolve around, expose, bathe, concentrate on, steering, hone in on, omphalos, thought, focal point, way, point, quick, seat, open, contention, blow up, emphasis, starting point, visible, edge, plain, listen, focalize, center on, capital, direction, pore, counselling, fade, play, pay attention, bottom, point of order, sharpen, point of convergence, camera, snap, contract, condense, perceptible, item, noticeable, rivet, strain, reasoning, reduce, assessment, localize, blink, photograph, come out, pop, focusing, side issue, forethought, magnetic pole, headquarters, heighten, camcorder, revolve about, flood, taper, boom, epicenter, nexus, take notice, ground zero, catch, counsel, ASA, start, compose, sidelight, zero in on, obvious, navel, digicam

centralize

centrality, middle

intercept, concentrate, meet, merge, unite, approach

convergence, concentration, meeting

funnel, lure, crux, spirit, essence, intersection, bottleneck, marrow, crossing, intersect, asymptote, hub, center, core, converge, polestar, gathering, gather, lodestar, nucleus, heart, plenum, kernel, axle, forum, epitome, rally, rendezvous, meat, magnet, soul

Usage examples:

• The Royal Society was still the principal focus of scientific activity. - "Our Legal Heritage, 4th Ed.", S. A. Reilly.
• But before I had the glass in focus more scales had fallen from my eyes; and now I knew why I had seen so much of Raffles these last few weeks, and why he had always come between seven and eight o'clock in the evening, and waited at this very window, with these very glasses at his eyes. - "A Thief in the Night", E. W. Hornung.
• Helen, wherever she was, would always be centre; things and people grouped themselves about her; she made the picture, and she was the focus of interest. - "Franklin Kane", Anne Douglas Sedgwick.