Definition of focus noun from the Oxford Advanced American Dictionary

      

    focus

     noun
    noun
    NAmE//ˈfoʊkəs//
     
    (pl. focuses or foci
    NAmE//ˈfoʊsaɪ//
     
    )
     
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  1. 1 [uncountable, countable, usually singular] the thing or person that people are most interested in; the act of paying special attention to something and making people interested in it It was the main focus of attention at the meeting. focus for something) His comments provided a focus for debate. focus on something We will keep our focus on the needs of the customer. In today's lecture the focus will be on recent changes in corporate tax structure. The incident brought the problem of violence in schools into sharp focus. What we need now is a change of focus (= to look at things in a different way).
  2. 2[uncountable] a point or distance at which the outline of an object is clearly seen by the eye or through a lens The children's faces are badly out of focus (= not clearly shown) in the photo. The binoculars were not in focus (= were not showing things clearly).
  3. 3(also focal point) [countable] (physics) a point at which waves of light, sound, etc. meet after reflection or refraction; the point from which waves of light, sound, etc. seem to come
  4. 4[countable] (geology) the point at which an earthquake starts to happen
See the Oxford Advanced Learner's Dictionary entry: focus