SOLIDITY

solidity. Solidity, n. fulness of matter, firmness, truth

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So‐lid″i‐ty (?), n. [[L. soliditas: cf. F. solidité.]] 1. 1. The state or quality of being solid; density; consistency, — opposed to fluidity; compactness; fullness of matter, — opposed to openness or hollowness; strength; soundness, — opposed to weakness or instability; the primary quality or affection of matter by which its particles exclude or resist all others; hardness; massiveness.
That which hinders the approach of two bodies when they are moving one toward another, I call solidity. Locke. 2. 2. Moral firmness; soundness; strength; validity; truth; certainty; — as opposed to weakness or fallaciousness; as, the solidity of arguments or reasoning; the solidity of principles, triuths, or opinions.
3. 3. (Geom.) The solid contents of a body; volume; amount of inclosed space.
Syn. — Firmness; solidness; hardness; density; compactness; strength; soundness; validity; certainty.