Etymology
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solid (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."

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 printed circuits and solid transistors" (as opposed to wires and vacuum tubes) is from 1959. Related: Solidly.

solid (n.)

late 14c., "three-dimensional figure," from solid (adj.). Meaning "a solid substance" is from 1690s. Compare also solidus; Latin solidus (adj.) was used as a noun meaning "an entire sum; a solid body."

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Definitions of solid
1
solid (adj.)
characterized by good substantial quality;
a solid base hit
solid comfort
solid (adj.)
of definite shape and volume; firm; neither liquid nor gaseous;
ice is water in the solid state
solid (adj.)
entirely of one substance with no holes inside;
a solid block of wood
solid (adj.)
of one substance or character throughout;
solid gold
carved out of solid rock
solid (adj.)
uninterrupted in space; having no gaps or breaks;
solid sheets of water
a solid line across the page
solid (adj.)
providing abundant nourishment;
good solid food
solid (adj.)
of good quality and condition; solidly built;
a solid foundation
Synonyms: strong / substantial
solid (adj.)
not soft or yielding to pressure;
solid ground
Synonyms: firm
solid (adj.)
having three dimensions;
a cube is a solid figure with six sides
solid (adj.)
impenetrable for the eye;
solid blackness
solid (adj.)
financially sound;
the bank is solid and will survive this attack
solid (adj.)
of a substantial character and not frivolous or superficial;
work of solid scholarship
based on solid facts
solid (adj.)
meriting respect or esteem;
Synonyms: upstanding
solid (adj.)
of the same color throughout;
solid color
Synonyms: self-colored / self-coloured
solid (adj.)
acting together as a single undiversified whole;
a solid voting bloc
Synonyms: unanimous / whole
2
solid (n.)
matter that is solid at room temperature and pressure;
solid (n.)
the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape;
Synonyms: solidness / solid state
solid (n.)
a three-dimensional shape;
From wordnet.princeton.edu