Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of definite shape and volume; not liquid or gaseous.
  • adjective Mathematics Of or relating to three-dimensional geometric figures or bodies.
  • adjective Firm or compact in substance.
  • adjective Not hollowed out.
  • adjective Being the same substance or color throughout.
  • adjective Having no gaps or breaks; continuous.
  • adjective Acting together; unanimous.
  • adjective Written without a hyphen or space. For example, the word software is a solid compound.
  • adjective Printing Having no leads between the lines.
  • adjective Of good quality.
  • adjective Substantial; hearty.
  • adjective Sound; reliable.
  • adjective Financially sound.
  • adjective Upstanding or dependable.
  • adjective Slang Excellent; first-rate.
  • noun A substance having a definite shape and volume; one that is neither liquid nor gaseous.
  • noun Mathematics A geometric figure having three dimensions.
  • adverb Without a break or opening; completely or continuously.
  • adverb As a whole; unanimously.

from The Century Dictionary.

  • Of uniform color; self-colored: a pigeon-fanciers' term.
  • Resisting flexure; not to be bent without force; capable of tangential stress: said of a kind of material substance. See II., 1.
  • Completely filled up; compact; without cavities, pores, or interstices; not hollow: as, a solid ball, as distinguished from a hollow one; solid soda-water, not frothy.
  • Firm; strong: as, a solid pier; a solid wall.
  • In botany, of a fleshy, uniform, undivided substance, as a bulb or root; not spongy or hollow within, as a stem.
  • In anatomy and zoology:
  • Hard, compact, or firm in consistency; having no cavities or spongy structure: opposed to spongiose, porous, hollow, cancellate, excavated, etc.
  • In entomology, specifically, formed of a single joint, or of several joints so closely applied that they appear to be one: especially said of the capitulum or club of capitate antennæ.
  • Having three dimensions; having length, breadth, and thickness; cubic: as, a solid foot contains 1,728 solid inches.
  • Sound; not weak; strong.
  • Substantial, as opposed to frivolous, fallacious, or the like; worthy of credit, trust, or esteem; not empty or vain; real; true; just; valid; firm; strong; hence, satisfactory: as, solid arguments; solid comfort; solid sense.
  • Not light, trifling, or superficial; grave; profound.
  • Financially sound or safe; possessing plenty of capital; wealthy; well-established; reliable.
  • Unanimous, or practically unanimous: as, a solid vote; the solid South.
  • Without break or opening, as a wall or façade.
  • Smooth; even; unbroken; unvaried: unshaded: noting a color or pigment.
  • Without the liquor, as oysters: said in measuring: opposite to in liquor.
  • With reference to fabrics, etc., a uniform color.
  • Synonyms Dense.
  • Stable, weighty, important.
  • noun A body which throughout its mass (and not merely at its surface) resists for an indefinite time a sufficiently small force that tends to alter its equilibrium figure, always springing back into shape after the force is removed; a body possessing elasticity of figure.
  • noun In geometry, a body or magnitude which has three dimensions—length, breadth, and thickness—being thus distinguished from a surface, which has but two dimensions, and from a line, which has but one.
  • noun plural In anatomy, all parts of the body which are not fluid: as, the solids and fluids of the body.
  • noun plural In printing, the parts of an engraving which show black or solid in print.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A substance that is held in a fixed form by cohesion among its particles; a substance not fluid.
  • noun (Geom.) A magnitude which has length, breadth, and thickness; a part of space bounded on all sides.
  • noun (Geom.) See Revolution, n., 5.
  • adjective Having the constituent parts so compact, or so firmly adhering, as to resist the impression or penetration of other bodies; having a fixed form; hard; firm; compact; -- opposed to fluid and liquid or to plastic, like clay, or to incompact, like sand.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English solide, from Old French, from Latin solidus; see sol- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Old French solide (as an adjective), from Latin solidus ("solid").

Examples

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