from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A linguistic element that always occurs as part of another word, such as -ly in lovely.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a unit of language that can be only be used as part of a word, not as a word on its own (such as the English suffix -ly)
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns
bound + form (Wiktionary)