So*lid"i*ty (?), n. [L. soliditas: cf. F.
solidité.]
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. 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. (Geom.) The solid contents of a
body; volume; amount of inclosed space.
Syn. --
Firmness; solidness;
hardness; density; compactness; strength;
soundness; validity;
certainty.
Hear it pronounced