/ˈfoʊkəs / (say 'fohkuhs)

noun (plural focuses or foci /ˈfoʊkaɪ/ (say 'fohkuy), /ˈfoʊki/ (say 'fohkee), /ˈfoʊsaɪ/ (say 'fohsuy))
1. Physics a point at which rays of light, heat, or other radiation, meet after being refracted or reflected.
2. Optics
a. a point from which diverging rays appear to proceed, or a point at which converging rays would meet if they could be prolonged in the same direction (virtual focus).
b. the focal length of a lens.
c. clear and sharply defined condition of an image.
d. the position of a viewed object, or the adjustment of an optical device, necessary to produce a clear image: in focus; out of focus.
3. a central point, as of attraction, attention, or activity: *Their store became the focus of rebellion in Lost Haven –kylie tennant, 1946.
4. Geometry one of the points from which the distances to any point of a given curve are in a linear relation.
5. Geology the point where an earthquake starts.
6. Pathology the primary centre from which a disease develops or in which it localises.
verb (focused or focussed, focusing or focussing)
verb (t)
7. to bring to a focus or into focus.
8. to concentrate; to focus one's attention.
verb (i)
9. to become focused.
10. out of focus, blurry.
{Latin: hearth, fireplace}
focusable, adjective
focuser, noun
Usage: The alternative and less common verb forms focussed and focussing defy the general rule that a two-syllable word with the stress on the first syllable does not double the final consonant when an inflection is added.

Australian English dictionary. 2014.


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