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rigid

[rij-id] /ˈrɪdʒ ɪd/
adjective
1.
stiff or unyielding; not pliant or flexible; hard:
a rigid strip of metal.
2.
firmly fixed or set.
3.
inflexible, strict, or severe:
a rigid disciplinarian; rigid rules of social behavior.
4.
exacting; thorough; rigorous:
a rigid examination.
5.
so as to meet precise standards; stringent:
lenses ground to rigid specifications.
6.
Mechanics. of, pertaining to, or noting a body in which the distance between any pair of points remains fixed under all forces; having infinite values for its shear modulus, bulk modulus, and Young's modulus.
7.
Aeronautics.
  1. (of an airship or dirigible) having a form maintained by a stiff, unyielding structure contained within the envelope.
  2. pertaining to a helicopter rotor that is held fixedly at its root.
Origin
1530-1540
1530-40; < Latin rigidus, equivalent to rig(ēre) to be stiff, stiffen + -idus -id4
Related forms
rigidity, rigidness, noun
rigidly, adverb
overrigid, adjective
overrigidly, adverb
overrigidness, noun
overrigidity, noun
subrigid, adjective
subrigidly, adverb
subrigidness, noun
subrigidity, noun
unrigid, adjective
unrigidly, adverb
unrigidness, noun
Synonyms
1. unbending, firm, inflexible. 2. immovable, static. 3. austere, stern, unyielding. See strict. 4, 5. demanding.
Antonyms
1. elastic. 3. lax.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for rigidity
  • As the neurons die, patients develop tremors, experience spells of rigidity and may lose their sense of smell.
  • Labour unions introduce rigidity into labour markets.
  • Comfort and rigidity are key features of the line of shoes.
  • The pair think they've mapped the mathematical underpinnings of its rigidity.
  • Yes to standards and no to the bureaucratic rigidity that undermines the best of our educational system.
  • The euro combines the rigidity of fixed exchange rates, without the discipline needed to prevent imbalances.
  • In addition, an injection-molded arch shank add torsional rigidity that keeps you balanced mile after mile.
  • At the same time, he makes much of the rigidity so evident among some in the majority.
  • The lack of rigidity that comes with this age-old design is mitigated here.
  • Molded nylon shank provides torsional rigidity and support.
British Dictionary definitions for rigidity

rigid

/ˈrɪdʒɪd/
adjective
1.
not bending; physically inflexible or stiff: a rigid piece of plastic
2.
unbending; rigorously strict; severe: rigid rules
adverb
3.
completely or excessively: the lecture bored him rigid
Derived Forms
rigidly, adverb
rigidity, rigidness, noun
Word Origin
C16: from Latin rigidus, from rigēre to be stiff
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for rigidity
n.

1620s, from Latin rigiditas "stiffness," from rigidus (see rigid).

rigid

adj.

early 15c., from Latin rigidus "hard, stiff, rough, severe," from rigere "be stiff," from PIE *reig- "stretch (tight), bind tightly, make fast" (cf. Old Irish riag "torture," Middle High German ric "band, string"). Related: Rigidly.

Online Etymology Dictionary, © 2010 Douglas Harper
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rigidity in Medicine

rigidity ri·gid·i·ty (rĭ-jĭd'ĭ-tē)
n.

  1. The quality or state of stiffness or inflexibility. Also called rigor.

  2. An aspect of the personality characterized by resistance to change.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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