Definitions

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

  • adjective Consisting of four parts or members.
  • adjective Four times as much in size, strength, number, or amount.
  • adjective Music Having four beats to the measure.
  • noun A fourfold amount or number.
  • transitive & intransitive verb To multiply or be multiplied by four.

from The Century Dictionary.

  • Consisting of four parts; completed in four separate or successive operations.
  • 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.
  • Fourfold; four times told.
  • noun A number, sum, etc., four times as great as that taken as the standard: as, to receive the quadruple of a given sum.

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

  • noun four times the sum or number; a fourfold amount.
  • adjective Fourfold
  • adjective (Mus.) that in which each measure is divided into four equal parts.
  • transitive verb To multiply by four; to increase fourfold; to double; to double twice.
  • intransitive verb To be multiplied by four; to increase fourfold; to become four times as much.

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

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

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

  • verb increase fourfold
  • adjective having four units or components
  • noun a quantity that is four times as great as another
  • noun a set of four similar things considered as a unit
  • adjective four times as great or many

Etymologies

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; see pel- in Indo-European roots.]

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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, enn.com, 10 Sep 2009.

    September 13, 2009