focal point

Noun

• the concentration of attention or energy on something
  • the focus of activity shifted to molecular biology
    
  • he had no direction in his life
    

• a central point or locus of an infection in an organism
  • the focus of infection
    

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

Related words

• Synonyms: 
  focus , focusing , focussing , direction , centering , nidus