closed circuit television

closed-circuit television

noun
a system of televising by cable to designated viewing sets, as within a factory for monitoring production operations, in a theater for viewing a special event taking place elsewhere, or in an office building as an aid to maintaining security.

Origin:
1945–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Closed circuit television is always a great word to know.
So is zedonk. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
the offspring of a zebra and a donkey.
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