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Definition of "focus" []

  • A point at which rays of light or other radiation converge or from which they appear to diverge, as after refraction or reflection in an optical system: the focus of a lens. Also called focal point. (noun)
  • See focal length. (noun)
  • The distinctness or clarity of an image rendered by an optical system. (noun)
  • The state of maximum distinctness or clarity of such an image: in focus; out of focus. (noun)
  • An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear: a camera with automatic focus. (noun)
  • A point of convergence of light or other electromagnetic radiation, particles, sound waves, etc, or a point from which they appear to diverge (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • The state of an optical image when it is distinct and clearly defined or the state of an instrument producing this image (noun)
  • A point upon which attention, activity, etc, is directed or concentrated (noun)
  • A fixed reference point on the concave side of a conic section, used when defining its eccentricity (noun)
  • The point beneath the earth's surface at which an earthquake or underground nuclear explosion originates (noun)
  • The main site of an infection or a localized region of diseased tissue (noun)
  • To bring or come to a focus or into focus (verb)
  • To fix attention (on); concentrate (verb)

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

Use "focus" in a sentence
  • "I think my grandfather is trying to tell me something. * focus Nate focus*"
  • "Ooohh my mind is so messed up today. * focus dear child focus* But then again, isn't my mind is ALWAYS messed up?"
  • "As an example, the ease and power of spinning the control dial to adjust manual focus in combination with _*focus bracketing*_: O was a most pleasant surprise, and the combination is better than what is offered by many DSLRs."