'focal point' definitions:

A point of convergence of light (or other radiation) or a point from which it diverges [syn: focus, focal point]

A central point or locus of an infection in an organism; "the focus of infection" [syn: focus, focal point, nidus]

The concentration of attention or energy on something; "the focus of activity shifted to molecular biology"; "he had no direction in his life" [syn: focus, focusing, focussing, focal point, direction, centering]