control tower

noun
a glass-enclosed, elevated structure for the visual observation and control of the air and ground traffic at an airport.
Also called tower.


Origin:
1915–20

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
control tower
 
n
a tower at an airport from which air traffic is controlled

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Watch the planes land and take off through binoculars and hear audio from the
  control tower.
Because there was little other traffic at the airport, communications with the
  control tower were noticeably relaxed.
The control tower at the local airport has a direct view of the site, which is
  kept well lit during the dark winter months.
The runway may be intact, but the control tower lost communications after the
  quake.
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