from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A word, such as a preposition, a conjunction, or an article, that has little semantic content of its own and chiefly indicates a grammatical relationship. Also called form word, functor.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A word that has little meaning when standing alone, but instead serves to express grammatical relationships with other words within a sentence, or specify the attitude or mood of the speaker, such as prepositions, pronouns, auxiliary verbs, or conjunctions.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a word that is uninflected and serves a grammatical function but has little identifiable meaning


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