a hole for inserting a key in a lock, especially one in the shape of a circle with a rectangle having a width smaller than the diameter of the circle projecting from the bottom.
Also called key. Basketball. the area at each end of the court that is bounded by two lines extending from the end line parallel to and equidistant from the sidelines and terminating in a circle around the foul line.
extremely private or intimate, especially with reference to information gained as if by peeping through a keyhole.
snooping and intrusive: a keyhole investigator.

1585–95; key1 + hole Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
keyhole (ˈkiːˌhəʊl)
1.  an aperture in a door or a lock case through which a key may be passed to engage the lock mechanism
2.  any small aperture resembling a keyhole in shape or function
3.  a transient column of vapour or plasma formed during the welding or cutting of materials, using high energy beams, such as lasers

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
He had the same problem in his right shoulder four years ago and had keyhole
  surgery to fix it.
The lock on his car door had frozen and he had to breathe on the keyhole to fit
  the key.
The map is mounted on wood material with beveled edges and a keyhole hanging
  slot on the back.
The other problem is that these networks offer us the world through a
  contemporary keyhole.
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