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

  • adj. Consisting of four parts or members.
  • adj. Four times as much in size, strength, number, or amount.
  • adj. Music Having four beats to the measure.
  • n. A fourfold amount or number.
  • transitive v. To multiply or be multiplied by four: quadrupled the order; quadrupled in size.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Being four times as long, as big or as many of something.
  • v. To multiply something by four times.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Fourfold
  • n. four times the sum or number; a fourfold amount.
  • intransitive v. To be multiplied by four; to increase fourfold; to become four times as much.
  • transitive v. To multiply by four; to increase fourfold; to double; to double twice.

from The Century Dictionary and Cyclopedia

  • Fourfold; four times told.
  • n. A number, sum, etc., four times as great as that taken as the standard: as, to receive the quadruple of a given sum.
  • To make four times as much or as many; multiply by four; repeat four times; make, do, or cause to happen four times over.
  • To become four times as much or as many; repeat itself four times.
  • Consisting of four parts; completed in four separate or successive operations.

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

  • v. increase fourfold
  • adj. having four units or components
  • n. a quantity that is four times as great as another
  • n. a set of four similar things considered as a unit
  • adj. four times as great or many


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

From Middle English quadriple, fourfold amount, and quadruple, tooth with four roots, both from Old French quadruple, from Latin quadruplum, from neuter of quadruplus, fourfold : quadru-, quadri-, quadri- + -plus, -fold.



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  • "Yields for plants fertilized with urine quadrupled and matched those of mineral-fertilized plants. The urine-fertilized tomatoes also contained more protein and were safe for human consumption."

    - Wagdy Sawahel, Tomatoes thrive on urine diet,, 10 Sep 2009.

    September 13, 2009