Point where light, heat or sound rays meet

noun

1. A center of activity, attraction, or attention

   "the focus of the meeting was drug abuse"

2. A point of concentration
3. Directed attention emphasis

   "The focus is on helping the homeless."

4. Direction

   "the team lost focus"

5. A state or condition permitting clear perception or understanding

   "tried to bring the issues into focus"

6. Adjustment for distinct vision
7. Focal length
8. A point at which rays (as of light, heat, or sound) converge or from which they diverge or appear to diverge
9. A point of convergence see convergence of a beam of particles (such as electrons)
10. One of the fixed points that with the corresponding directrix defines a conic section
11. A localized area of disease or the chief site of a generalized disease or infection
12. The place of origin of an earthquake or moonquake

noun

1. A photographic effect or technique (as in filmmaking) characterized by great depth of field