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focus [ˈfoʊkəs]

1 focus noun
  • a subject that is being discussed or studied : the subject on which people's attention is focused—usually singular
  • a main purpose or interest
  • a point at which rays of light, heat, or sound meet or from which they move apart or appear to move apart; especially : the point at which an image is formed by a mirror, a lens, etc.

2 focus verb
  • to cause (something, such as attention) to be directed at something specific—+ on
  • to direct your attention or effort at something specific —often + on
  • to adjust (something, such as a lens or a camera) to make an image clear