Noun
The word is derived from focus
of Focus
Source: Webster's dictionaryUltimately the galaxy, indeed the sum of the universe in its entirety, was mostly nothing; average it all out and it made a pretty good vacuum. But within the foci of matter there were the systems, the stars and planets and habitats-what a cornucopia of life was there! Iain Banks
A circle is an ellipse with an eccentricity of zero, meaning that the two foci coincide with each other as the centre of the circle. Source: Internet
A simple way of producing a hyperboloid is to rotate a hyperbola about the axis of its foci or about its symmetry axis perpendicular to the first axis; these rotations produce hyperboloids of two and one sheet, respectively. Source: Internet
Areas of one's communities which require assistance and beneficiaries must be a Muslim's foci if need be, rather than strictly her or his personal or superficial wants. Source: Internet
Also shown are: semi-major axis a, semi-minor axis b and semi-latus rectum p; center of ellipse and its two foci marked by large dots. Source: Internet
By these methods it is found that replication foci of varying size and positions appear in S phase of cell division and their number per nucleus is far smaller than the number of genomic replication forks. Source: Internet