sub·stan·tial

[suhb-stan-shuhl]
adjective
1.
of ample or considerable amount, quantity, size, etc.: a substantial sum of money.
2.
of a corporeal or material nature; tangible; real.
3.
of solid character or quality; firm, stout, or strong: a substantial physique.
4.
basic or essential; fundamental: two stories in substantial agreement.
5.
wealthy or influential: one of the substantial men of the town.
6.
of real worth, value, or effect: substantial reasons.
7.
pertaining to the substance, matter, or material of a thing.
8.
of or pertaining to the essence of a thing; essential, material, or important.
9.
being a substance; having independent existence.
10.
Philosophy. pertaining to or of the nature of substance rather than an accident or attribute.
noun
11.
something substantial.
00:10
Substantial is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.

Origin:
1300–50; Middle English substancial < Late Latin substantiālis, equivalent to Latin substanti(a) substance + -ālis -al1

sub·stan·ti·al·i·ty, sub·stan·tial·ness, noun
sub·stan·tial·ly, adverb
non·sub·stan·tial, adjective
non·sub·stan·tial·ly, adverb
non·sub·stan·tial·ness, noun
non·sub·stan·ti·al·i·ty, noun
pre·sub·stan·tial, adjective
su·per·sub·stan·tial, adjective
su·per·sub·stan·tial·ly, adverb


3. stable, sound. 6. valid, important.


2. immaterial, ethereal.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
substantial (səbˈstænʃəl) [Click for IPA pronunciation guide]
 
adj
1.  of a considerable size or value: substantial funds
2.  worthwhile; important: a substantial reform
3.  having wealth or importance
4.  (of food or a meal) sufficient and nourishing
5.  solid or strong in construction, quality, or character: a substantial door
6.  real; actual; true: the evidence is substantial
7.  of or relating to the basic or fundamental substance or aspects of a thing
8.  philosophy of or relating to substance rather than to attributes, accidents, or modifications
 
substantiality
 
n
 
sub'stantialness
 
n
 
sub'stantially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

substantial
mid-14c., "ample, sizeable," from O.Fr. substantiel (13c.), from L. substantialis "having substance or reality, material," from substantia (see substance). Meaning "existing, having real existence" is from late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Many strategies for reining in greenhouse gases come with substantial health
  benefits, according to a new study.
If intermarriage is not taking place at a substantial rate, it could be a sign
  of a broader culture clash.
It too is composed mostly of iron, plus substantial amounts of sulfur and
  nickel.
There will be a substantial lag if for no other reason that it takes a while to
  heat the whole ocean.
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