adjective, solider, solidest.
having three dimensions (length, breadth, and thickness), as a geometrical body or figure.
of or relating to bodies or figures of three dimensions.
having the interior completely filled up, free from cavities, or not hollow: a solid piece of chocolate.
without openings or breaks: a solid wall.
firm, hard, or compact in substance: solid ground.
having relative firmness, coherence of particles, or persistence of form, as matter that is not liquid or gaseous: solid particles suspended in a liquid.
pertaining to such matter: Water in a solid state is ice.
dense, thick, or heavy in nature or appearance: solid masses of cloud.
not flimsy, slight, or light, as buildings, furniture, fabrics, or food; substantial.
of a substantial character; not superficial, trifling, or frivolous: a solid work of scientific scholarship.
without separation or division; continuous: a solid row of buildings.
whole or entire: one solid hour.
forming the whole; consisting entirely of one substance or material: solid gold.
uniform in tone or shades, as a color: a solid blue dress.
real or genuine: solid comfort.
sound or reliable, as reasons or arguments: solid facts.
sober-minded; fully reliable or sensible: a solid citizen.
financially sound or strong: Our company is solid.
cubic: A solid foot contains 1728 solid inches.
written without a hyphen, as a compound word.
having the lines not separated by leads, or having few open spaces, as type or printing.
thorough, vigorous, great, big, etc. (with emphatic force, often after good ): a good solid blow.
firmly united or consolidated: a solid combination.
united or unanimous in opinion, policy, etc.
on a friendly, favorable, or advantageous footing (often preceded by in ): He was in solid with her parents.
Slang. excellent, especially musically.
a body or object having three dimensions (length, breadth, and thickness).
a solid substance or body; a substance exhibiting rigidity.

1350–1400; Middle English < Latin solidus

solidly, adverb
solidness, noun
half-solid, adjective
nonsolid, adjective, noun
nonsolidly, adverb
subsolid, noun
transsolid, adjective
unsolid, adjective
unsolidly, adverb
unsolidness, noun

solid, stolid.

1. cubic. 5. dense. See firm1. 6. cohesive, firm. 9. sound. 11. unbroken. 18. solvent. 22. strong.

1. flat. 6. loose. 11, 24. divided. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
solid (ˈsɒlɪd)
1.  liquid Compare gas of, concerned with, or being a substance in a physical state in which it resists changes in size and shape
2.  consisting of matter all through
3.  of the same substance all through: solid rock
4.  sound; proved or provable: solid facts
5.  reliable or sensible; upstanding: a solid citizen
6.  firm, strong, compact, or substantial: a solid table; solid ground
7.  (of a meal or food) substantial
8.  (often postpositive) without interruption or respite; continuous: solid bombardment
9.  financially sound or solvent: a solid institution
10.  strongly linked or consolidated: a solid relationship
11.  geometry having or relating to three dimensions: a solid figure; solid geometry
12.  (of a word composed of two or more other words or elements) written or printed as a single word without a hyphen
13.  printing with no space or leads between lines of type
14.  solid for unanimously in favour of
15.  (of a writer, work, performance, etc) adequate; sensible
16.  of or having a single uniform colour or tone
17.  informal (NZ) excessive; unreasonably strict
18.  geometry
 a.  a closed surface in three-dimensional space
 b.  such a surface together with the volume enclosed by it
19.  a solid substance, such as wood, iron, or diamond
20.  (plural) solid food, as opposed to liquid
[C14: from Old French solide, from Latin solidus firm; related to Latin sollus whole]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1391, from O.Fr. solide "firm, dense, compact," from L. solidus "firm, whole, entire" (related to salvus "safe"), from PIE base *sol- "whole" (cf. Gk. holos "whole," L. salus "health;" see safe (adj.)). Slang sense of "wonderful, remarkable" first attested 1920 among jazz musicians.
The noun is recorded from 1495. Solid South in U.S. political history is attested from 1858. Solidify is from 1799 (trans.), 1837 (intrans.). Solid state as a term in physics is recorded from 1953; meaning "employing transistors (as opposed to vacuum tubes)" is from 1959.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

solid sol·id (sŏl'ĭd)

  1. Of definite shape and volume; not liquid or gaseous.

  2. Firm or compact in substance.

  3. Having no internal cavity or hollow.

  1. A solid substance, body, or tissue.

  2. Food that is relatively firm in substance or that must be chewed before swallowing.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
solid   (sŏl'ĭd)  Pronunciation Key 
  1. Physics One of four main states of matter, in which the molecules vibrate about fixed positions and cannot migrate to other positions in the substance. Unlike a gas or liquid, a solid has a fixed shape, and unlike a gas, a solid has a fixed volume. In most solids (with exceptions such as glass), the molecules are arranged in crystal lattices of various sizes.

  2. Mathematics A geometric figure that has three dimensions.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

solid definition

A phase of matter characterized by the tight locking of atoms into rigid structures that resist deforming by outside forces.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Imagine a high-tech machine that can see through solid rock to the complete
  dinosaur within.
We have a solid rock to stand on, liquid water to sustain us, and an atmosphere
  to shield us from radiation.
The peaked roofs, solid colors, and simple shapes of the birdhouses lend
  continuity to the design.
Then begin polishing with wet-dry sandpaper, diamond pads, or solid
  aluminum-carbide blocks.
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