laugh track

a separate sound track of prerecorded laughter added to the sound track of a radio or television program to enhance or feign audience responses.

1960–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To laugh track
Example sentences
Even if the robot creeps you out, a laugh track might tell you to feel other
It is a perfect example of that weird sitcom blend of real rage punctuated by
  timed breaks for the laugh track.
The live laugh is more infectious than a laugh track.
Facing a slump in the sitcom genre, some producers are taking new series off
  the beaten laugh track.
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