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quadruple

adjective

  1. consisting of or including four
  2. four times as much or as many; fourfold
  3. Music containing four beats to the measure: quadruple time

noun

an amount four times as much or as many

transitive verb, intransitive verb quadrupled, quadrupling

to make or become four times as much or as many; multiply by four

See quadruple in American Heritage Dictionary 4

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