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plural foci
ˈfō-ˌsī
also -ˌkī
also focuses
3
c
: adjustment for distinct vision
also
: the area that may be seen distinctly or resolved into a clear image
d
4
a
: a point at which rays (as of light, heat, or sound) converge or from which they diverge or appear to diverge
specifically
: the point where the geometrical lines or their prolongations conforming to the rays diverging from or converging toward another point intersect and give rise to an image after reflection by a mirror or refraction by a lens or optical system
b
: a point of convergence (see convergence sense 1) of a beam of particles (such as electrons)
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Merriam-Webster unabridged
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- Often used to describe “the march of time,” what does inexorable mean?


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