| Definition -
Using words as nouns.
1. The OED deemed this a nonce word.
Example - I wonder how many the's you'll find in that book.
(In the above, we have turned the definite article the into a noun, thus we are nouning it.)
Oxford English Dictionary - The term's first and only citation is from 1757:
"As to the Nouning and Verbing, which he so heavily charged you with."
(E. Griffith Lett. Henry & Frances (1767) IV. 60)