The spelling cutting-edge is used for meaning 3.
1 n-sing If you are at thecutting edgeof a particular field of activity, you are involved in its most important or most exciting developments.
usu at/on the N of n
This shipyard is at the cutting edge of world shipbuilding technology.
2 n-sing If someone or something gives you a cutting edge, they give you an advantage over your competitors.
If Pearce had been fit, we would have won. We missed the cutting edge he would have given us.
3 adj Cutting-edge techniques or equipment are the most advanced that there are in a particular field.
usu ADJ n
What we are planning is cutting-edge technology never seen in Australia before...
Translation English - Cobuild Collins Dictionary
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"