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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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British Dictionary definitions for over 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 over rigidity

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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