n. - 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.
n. - 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.
n. - The solid contents of a body; volume; amount of inclosed
space.