from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An adjective used as a noun, such as merciful in Blessed are the merciful.
from The Century Dictionary.
- noun In grammar, an adjective or attributive word; an adjunct to a noun; specifically, according to some grammarians, an adjective used substantively, as the good, the true, and the beautiful.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Gram.), rare An adjective, or attribute.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun grammar An
adjectiveused as a noun.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an adjective used as a noun
from The American Heritage® Dictionary of the English Language, 4th Edition
[ad– + noun (modeled on adverb).]
It is not, in all cases, easy to determine to which of these classes an adnoun should be referred.