Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Mathematics A subscript.
  • noun An index of measurement based on relatively few variables, especially a trade index based on the performance of a particular group or type of stocks.

from The Century Dictionary.

  • noun A specifying figure or letter following and slightly below a figure, letter, or symbol: as the 0 in x0.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Math.) A number or mark placed opposite the lower part of a letter or symbol to distinguish the symbol.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A subsidiary index, or one that represents a sector of a larger one
  • noun mathematics A subscript

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