Foci, the plural of focus, is defined as a point of attention.
An example of foci are the three points that a company is choosing to concentrate on in a quarter.
Foci Sentence Examples
The excitable foci of the cerebral cortex are well myelinated long before the unexcitable are so.
Larger and thicker in the rabbit, when excited it gives rise in that animal to movements of the eyes and of the fore-limbs and neck; but it is only in much higher types, such as the dog, that the cortex yields, under experimental excitation, definitely localized foci, whence can be evoked movements of the fore-limb, hind-limb, neck, eyes, ears and face.
F2' =objectand image-side foci of eyepiece.
F 1 ' =objectand image-side foci of objective.
According to the laws of optics it is only possible either to portray a small object near one of the foci of the system with wide pencils, or to produce an image from a relatively large object by correspondingly narrow pencils.