Focal point

central focus, most important part, main point

Noun
1. a point of convergence of light (or other radiation) or a point from which it diverges
(synonym) focus
(hypernym) point
2. a central point or locus of an infection in an organism; "the focus of infection"
(synonym) focus, nidus
(hypernym) point
(part-holonym) focal infection

focal point
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