Definition of "projector"

projector

/pɹəˈd͡ʒɛktɚ/

noun
plural projectors
1. Someone who devises or suggests a project; a proposer or planner of something.
  Quotations
  So far is it from the kenne of theſe wretched projectors of ours that beſcraull their Pamflets every day with new formes of government for our Church.
  1642 (indicated as 1641), John Milton, “That Church-governement is Prescrib’d in the Gospell, and that to Say Otherwise is Unsound”, in The Reason of Church-governement Urg’d against Prelaty […], London: […] E[dward] G[riffin] for Iohn Rothwell, […], 1st book, page 4
  [A]s the Doctor neither did this, nor yet sent him an answer, the projector wrote a second letter […].
  1791, Thomas Paine, Rights of Man
2. An optical device that projects a beam of light, especially one used to project an image (or moving images) onto a screen.
3. (psychology) One who projects, or ascribes his/her own feelings to others.
  Quotations
  Projectors attempt to get rid of unwanted feelings, only it does not work; they still experience the unwanted feelings […]
  1982, The Gestalt Journal, volume 5, page 44
4. (mathematics) An operator that forms a projection.