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  1. SOLID Definition & Meaning - Merriam-Webster

    The meaning of SOLID is being without an internal cavity. How to use solid in a sentence.

  2. Solid - Wikipedia

    Solid-state physics is the study of rigid matter, or solids, through methods such as solid-state chemistry, quantum mechanics, crystallography, electromagnetism, and metallurgy.

  3. Solid | Definition & Facts | Britannica

    Jan 31, 2026 · Solid, one of the three basic states of matter, the others being liquid and gas. A solid forms from liquid or gas because the energy of atoms decreases when the atoms take up …

  4. What Is a Solid? Definition and Examples in Science

    Oct 19, 2020 · Because its particles are packed close together, a solid is rigid, doesn’t flow, and isn’t easily compressed. A solid is defined as a state of matter with a definite shape and volume.

  5. SOLID | definition in the Cambridge English Dictionary

    SOLID meaning: 1. hard or firm, keeping a clear shape: 2. completely hard or firm all through an object, or…. Learn more.

  6. Solid - Definition, Meaning & Synonyms | Vocabulary.com

    A solid, as opposed to a liquid or gas, has a size and shape to it. It doesn't flow like water or disappear into the air.

  7. Solid - definition of solid by The Free Dictionary

    Without a break or opening; completely or continuously: The theater was booked solid for a month.

  8. solid - WordReference.com Dictionary of English

    Physics having relative firmness, coherence of particles, or persistence of form, as matter that is not liquid or gaseous: solid particles suspended in a liquid.

  9. solid - Wiktionary, the free dictionary

    Jan 20, 2026 · solid (comparative more solid or solider, superlative most solid or solidest) (of an object or substance) That can be picked up or held, having a texture, and usually firm. Unlike a …

  10. Solid Facts for Kids

    A solid is one of the three main states of matter. In solids, the tiny molecules are packed very close together. They can only vibrate in place, like shaking in one spot. This is why solids have …