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Wordnet 3.0

NOUN (2)

1. something hard to endure;
- Example: "the asperity of northern winters"
[syn: asperity, grimness, hardship, rigor, rigour, severity, severeness, rigorousness, rigourousness]

2. excessive sternness;
- Example: "severity of character"
- Example: "the harshness of his punishment was inhuman"
- Example: "the rigors of boot camp"
[syn: severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness, stiffness]


The Collaborative International Dictionary of English v.0.48:

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. [1913 Webster] We do not connect the scattered phenomena into their rigorous unity. --De Quincey. [1913 Webster] 2. Severe; intense; inclement; as, a rigorous winter. [1913 Webster] 3. Violent. [Obs.] "Rigorous uproar." --Spenser. [1913 Webster] 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. [1913 Webster]
WordNet (r) 3.0 (2006):

rigorousness n 1: something hard to endure; "the asperity of northern winters" [syn: asperity, grimness, hardship, rigor, rigour, severity, severeness, rigorousness, rigourousness] 2: excessive sternness; "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp" [syn: severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness, stiffness]