cutting edge

noun
1.
the sharp edge of a cutting implement.
2.
forefront; lead: on the cutting edge of computer technology.
Origin:
1950–55

Related forms
cut·ting-edge, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
cutting edge
 
—n
1.  the leading position in any field; forefront: on the cutting edge of space technology
 
—adj
2.  at the forefront of people or things in a field of activity; leading: cutting-edge technology

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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00:10
Cutting edge is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
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Etymonline
Word Origin & History

cutting edge
also cutting-edge, 1825 in the literal sense (often at first with reference to plows); fig. sense is from c.1970.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But in mems, people don't operate on the cutting edge.
Hyphenated-Americans can be found along the cutting edge of all the arts.
However, my sense is that these efforts remain far more at the cutting edge
  than they should.
And that vehicle was supposed to have incorporated the cutting edge technology
  of the day.
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