focal point
n 1: a point of convergence of light (or other radiation) or a
point from which it diverges [syn: {focus}, {focal point}]
2: a central point or locus of an infection in an organism; "the
focus of infection" [syn: {focus}, {focal point}, {nidus}]
3: 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}]