Dictionary
rig•or•ous
Pronunciation: (rig'ur-us), [key]—
adj.
1. characterized by rigor; rigidly severe or harsh, as people, rules, or discipline:
rigorous laws.
2. severely exact or accurate; precise:
rigorous research.
3. (of weather or climate) uncomfortably severe or harsh; extremely inclement.
4. Logic, Math.logically valid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.