foci

Noun

focus (countable and uncountable, plural foci or focuses or focusses)

1. (countable) A point at which reflected or refracted rays of light converge.
   • The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.

   Synonyms:

   focal point

2. (countable) A point of a conic at which rays reflected from a curve or surface converge.
3. (uncountable) The fact of the convergence of light on the photographic medium.
   • Unfortunately, the license plate is out of focus in this image.
4. (uncountable) The quality of the convergence of light on the photographic medium.
   • During this scene, the boy’s face shifts subtly from soft focus into sharp focus.
5. (uncountable) Concentration of attention.
   • I believe I can bring the high degree of focus required for this important job.
6. (countable) Something to which activity, attention or interest is primarily directed.
   • My studies are my main focus right now.

   Synonyms:

   focal point

See all 19 meanings of focus