I focussed my attention upon the twenty-foot-wide square that was the Keeper's foot.
The haughty droop of the eyes was focussed now upon the Assistant Commissioner.
The lady who stepped forward at this summons was greeted with a wide stare, and every eye-glass was focussed.
They have not been fused in the rapture of some unique mood, not focussed by the intensity of an emotion.
Suddenly he got up, looking across no longer vaguely, but with focussed eyes, and she turned.
He will not mount it as a specimen and he is not interested in seeing it explained or focussed.
Presently he stepped back into his tent, picked up his field-glasses and, returning, focussed them on a distant point of the road.
There must be something wrong at the other end—where the Ray is focussed!
It is all focussed so finely, and it is so delicately coloured and outlined that it can only be compared to a pastel.
Her speculations concerning it must be focussed and interpreted.
1640s, from Latin focus "hearth, fireplace" (also, figuratively, "home, family"), of unknown origin, used in post-classical times for "fire" itself, taken by Kepler (1604) in a mathematical sense for "point of convergence," perhaps on analogy of the burning point of a lens (the purely optical sense of the word may have existed before Kepler, but it is not recorded). Introduced into English 1650s by Hobbes. Sense transfer to "center of activity or energy" is first recorded 1796.
1775 in the literal sense; 1807 in the figurative sense, from focus (n.). Related: Focused; focusing; less commonly focussed; focussing.
focus fo·cus (fō'kəs)
n. pl. fo·cus·es or fo·ci (-sī', -kī')
A point at which rays of light or other radiation converge or from which they appear to diverge, as after refraction or reflection in an optical system. Also called focal point.
See focal length.
The distinctness or clarity of an image rendered by an optical system.
The state of maximum distinctness or clarity of such an image.
An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear.
The region of a localized bodily infection or disease.
To cause light rays or other radiation to converge on or toward a central point; concentrate.
To render an object or image in clear outline or sharp detail by adjustment of one's vision or an optical device.
To adjust a lens or instrument to produce a clear image.
To converge on or toward a central point of focus; be focused.
Plural focuses or foci (fō'sī', fō'kī')