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The Collaborative International Dictionary of English v.0.48 (gcide)

Rigorous \Rig"or*ous\, a. [F. rigoureux, LL. rigorosus. See
{Rigor}.]
1. Manifesting, exercising, or favoring rigor; 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.
[1913 Webster]

He shall be thrown down the Tarpeian Rock
With rigorous hands. --Shak.
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We do not connect the scattered phenomena into their
rigorous unity. --De Quincey.
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2. Severe; intense; inclement; as, a rigorous winter.
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3. Violent. [Obs.] "Rigorous uproar." --Spenser.
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4. (Mathematics, Logic) Adhering scrupulously and exactly to
accepted principles; hence, logically valid; as, a
rigorous proof.
[PJC]

Syn: Rigid; inflexible; unyielding; stiff; severe; austere;
stern; harsh; strict; exact.
[1913 Webster] -- {Rig"or*ous*ly}, adv. --
{Rig"or*ous*ness}, n.
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