approach light

approach light

noun Aeronautics.
one of a series of lights installed along the projected centerline of an airport runway to assist a pilot in aligning the aircraft during the approach to landing at night.

Origin:
1925–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Approach light is always a great word to know.
So is shear stress. Does it mean:
external force acting on an object or surface parallel to the slope or plane
axial force causing a body to become longer along direction of applied force
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