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

  • n. A set of words that have one or more grammatical or syntactic characteristics in common, such as the class of transitive verbs in English.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A collection of organisms that is given formal recognition at the rank of class with a taxonomic name, but which is known to be an artificial group rather than a natural one.

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

  • n. one of the traditional categories of words intended to reflect their functions in a grammatical context


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