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

  • n. Mathematics The symbol -, as in 4 - 2 = 2, that is used to indicate subtraction or a negative quantity.
  • n. Chemistry The same symbol, used to indicate levorotatory rotation of polarized light.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The symbol − or - used to denote the operation of subtraction and to indicate that a number is negative.

from the GNU version of the Collaborative International Dictionary of English

  • adj. the sign [-] denoting minus, or less, prefixed to negative quantities, or quantities to be subtracted. See Negative sign, under Negative.

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

  • n. a sign indicating the operation of subtraction

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