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

  • n. A noun, such as sand, oil, or honesty, that denotes a substance or concept indivisible into countable units and is preceded in English indefinite constructions by modifiers such as some or much rather than a or one.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A noun that normally cannot be counted.

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

  • n. a noun that does not form plurals


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