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one-way mirror

noun
1.
a sheet of glass that can be seen through from one side and is a mirror on the other, used especially for observation of criminal suspects by law-enforcement officials or witnesses.
Also called two-way mirror.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for one-way mirror
  • Through a one-way mirror, a video camera is recording the transaction.
  • Her new plan is to turn out the lights and put a reflective sheet against the window, transforming it into a one-way mirror.
  • Rather than watching through a one-way mirror, clients observe from their computer terminals.
  • The box is composed of a one-way mirror attached directly to the wall.
  • Generally, the therapist provides the coaching from behind a one-way mirror.
  • Each site must also equip a room with a one-way mirror and sound system to provide subsequent training for the teachers.
  • It had a window covered by a shade on one wall and a one-way mirror on another.
  • Police offices, social workers, and other professionals can observe the interview through a one-way mirror.
  • There was a one-way mirror by which the detectives could see into the room without being seen.
  • If the groups are in a room without a one-way mirror, limit the number of observers to one or two.

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