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PIE root

From Old French, from Late Latin rigorosus.


rigorous ‎(comparative more rigorous, superlative most rigorous)

  1. Manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.
    • 2013 August 3, “Boundary problems”, The Economist, volume 408, number 8847: 
      Economics is a messy discipline: too fluid to be a science, too rigorous to be an art. Perhaps it is fitting that economists’ most-used metric, gross domestic product (GDP), is a tangle too. GDP measures the total value of output in an economic territory. Its apparent simplicity explains why it is scrutinised down to tenths of a percentage point every month.
  2. Severe; intense; inclement; as, a rigorous winter.
  3. Violent.




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