glide slope

noun Aeronautics.
the angle that the glidepath of an aircraft or spacecraft makes with the horizontal.
Also called glide angle, gliding angle.

1945–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glide path or glide slope
the approach path of an aircraft when landing, usually defined by a radar beam
glide slope or glide slope

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Additionally, a glide slope beam provided vertical cues.
The accident pilot informed him that aware of the glide slope being out of
  service and that he would probably delay his flight.
Check to see if a visual or electronic glide slope is available before
  departing to your destination.
Install new glide slope tower antennas, cabling, and conduit.
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