1the centre of interest or activity:this generation has made the environment a focus of attention
an act of concentrating interest or activity on something:our focus on the customer’s requirements
Geology the point of origin of an earthquake.Compare with epicentre.
Medicine the principal site of an infection or other disease.
2 [mass noun] the state or quality of having or producing clear visual definition:his face is rather out of focus figurativethe incident brought her feelings for Alexander sharply into focus
[count noun] the point at which an object must be situated with respect to a lens or mirror for an image of it to be well defined.
[count noun] a device on a lens which can be adjusted to produce a clear image.
3 Geometry one of the fixed points from which the distances to any point of a given curve, such as an ellipse or parabola, are connected by a linear relation.
4 Linguistics an element of a sentence that is given prominence by intonational or other means.
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Universal
1adapt to the prevailing level of light and become able to see clearly:try to focus on a stationary object
[with object] cause (one’s eyes) to focus:she focused her eyes on his face
[with object] adjust the focus of (a telescope, camera, or other instrument):they were focusing a telescope on a star
(of rays or waves) meet at a single point.
[with object] (of a lens) make (rays or waves) meet at a single point.
[no object] (of light, radio waves, or other energy) become concentrated into a sharp beam.
[with object] (of a lens) concentrate (light, radio waves, or energy) into a sharp beam.
2 (focus on) pay particular attention to:the study will focus on a number of areas in Wales
[with object] concentrate:an opportunity to focus research on the health needs of the population
[with object] Linguistics place the focus on (an element of a sentence).
