projector (plural projectors)

  1. Someone who devises or suggests a project; a proposer or planner of something. [from 16th c.]
    • 1791, Thomas Paine, Rights of Man:
      [A]s the Doctor neither did this, nor yet sent him an answer, the projector wrote a second letter […].
  2. An optical device that projects a beam of light, especially one used to project an image (or moving images) onto a screen. [from 19th c.]
  3. (psychology) One who projects, or ascribes his/her own feelings to others.
    • 1982, The Gestalt Journal (volume 5, page 44)
      Projectors attempt to get rid of unwanted feelings, only it does not work; they still experience the unwanted feelings […]
  4. (maths) An operator that forms a projection.

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