American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
(3)
Elsewhere on the web
No other conservation tool can claim the same level of rigour, the same degree of transparency and the same amount of debate and consultation.— New Scientist - Online News
He added: "As with many processes that implement increased rigour, there is a need for identification of increased funding in order to increase the fidelity in project risk assessment."— StrategyPage.com
He never swerved from his resolution to pursue all duellists with the utmost rigour, and many were executed in various parts of the country.— Memoirs of Extraordinary Popular Delusions and the Madness of Crowds

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You can expect to see this word about twice a month.
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