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

  • adjective Multiplied by four; quadruple.
  • adjective Fourth in a group of four identical things.
  • noun One of a group of four identical things.
  • transitive & intransitive verb To multiply or be multiplied four times.

from The Century Dictionary.

  • To make fourfold; double twice.
  • Fourfold; four times repeated: as, a quadruplicate ratio or proportion. Also quadriplicated.
  • noun One of four things corresponding in all respects to one another, or to a common original.

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

  • transitive verb To make fourfold; to double twice; to quadruple.
  • adjective Fourfold; doubled twice; four times repeated.
  • adjective (Math.), rare Raised to the fourth power.

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

  • adjective having four parts
  • noun in quadruplicate: four times over, in four copies
  • verb To replicate four times

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

  • noun any four copies; any of four things that correspond to one another exactly
  • verb reproduce fourfold
  • adjective having four units or components


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

[Latin quadruplicātus, past participle of quadruplicāre, to multiply by four, from quadruplex, fourfold : quadru-, quadri-, quadri- + -plex, -fold; see duplex.]


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