adjective, sol·id·er, sol·id·est.

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


  1. a body or object having three dimensions (length, breadth, and thickness).
  2. a solid substance or body; a substance exhibiting rigidity.


  1. of, concerned with, or being a substance in a physical state in which it resists changes in size and shapeCompare liquid (def. 1), gas (def. 1)
  2. consisting of matter all through
  3. of the same substance all throughsolid rock
  4. sound; proved or provablesolid facts
  5. reliable or sensible; upstandinga solid citizen
  6. firm, strong, compact, or substantiala solid table; solid ground
  7. (of a meal or food) substantial
  8. (often postpositive) without interruption or respite; continuoussolid bombardment
  9. financially sound or solventa solid institution
  10. strongly linked or consolidateda solid relationship
  11. geometry having or relating to three dimensionsa 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. NZ informal excessive; unreasonably strict


  1. geometry
    1. a closed surface in three-dimensional space
    2. such a surface together with the volume enclosed by it
  2. a solid substance, such as wood, iron, or diamond
  3. (plural) solid food, as opposed to liquid

adj.late 14c., “not empty or hollow,” from Old French solide “firm, dense, compact,” from Latin solidus “firm, whole, undivided, entire,” figuratively “sound, trustworthy, genuine,” from PIE *sol-ido-, suffixed form of root *sol- “whole” (cf. Greek holos “whole,” Latin salus “health,” salvus “safe;” see safe (adj.)). Meaning “firm, hard, compact” is from 1530s. Meaning “entirely of the same stuff” is from 1710. Of qualities, “well-established, considerable” c.1600. As a mere intensifier, 1830. Slang sense of “wonderful, remarkable” first attested 1920 among jazz musicians. As an adverb, “solidly, completely,” 1650s. Solid South in U.S. political history is attested from 1858. Solid state as a term in physics is recorded from 1953; meaning “employing solid transistors (as opposed to vacuum tubes)” is from 1959. Related: Solidly. n.late 14c., “three-dimensional figure,” from solid (adj.). Meaning “a solid substance” is from 1690s. Cf. also solidus; Latin solidus (adj.) was used as a noun meaning “an entire sum; a solid body.” adj.

  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.

  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.

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

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