A point of convergence of light (or other radiation) or a point from which it diverges.

synonym: focus.

Dutch: brandpunt, focus
Polish: fokus, ognisko

A central point or locus of an infection in an organism.

synonyms: focus, nidus.

Dutch: infectiehaard

The concentration of attention or energy on something.

synonyms: centering, direction, focus, focusing, focussing.

Dutch: focus, scherpstelling