Solidity

n.	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.

Noun	1.	solidity - the consistency of a solid Synonyms: solidness Antonyms: porosity, porousness - the property of being porous; being able to absorb fluids
	2.	solidity - state of having the interior filled with matter Antonyms: hollowness - the state of being hollow: having an empty space within

abidingness, aplomb, authenticity, authoritativeness, authority, balance, balanced personality, body, calculability, callosity, callousness, changelessness, closeness, cogency, combination, compactness, completeness, comprehensiveness, concreteness, congestedness, congestion, consistence, consistency, constancy, cool, credit standing, crowdedness, denseness, density, dependability, durability, durableness, duration, durity, endurance, entireness, entirety, equilibrium, exhaustiveness, faithworthiness, fastness, firmness, fixedness, flintiness, force, frozenness, fusion, gluiness, hardening, hardness, hardness of heart, homeostasis, identity, immobility, immobilization, immovability, immovableness, immutability, impenetrability, impermeability, imperturbability, imporosity, inclusiveness, incompressibility, individuality, indivisibility, induration, inertia, inextricability, inflexibility, intactness, integrality, integration, integrity, invariability, invariableness, inveteracy, invincibility, inviolability, irreducibility, irremovability, jammedness, justness, lastingness, long standing, mass, materiality, nerve, obduracy, omnipresence, oneness, organic unity, palpability, particularity, permanence, permanency, perpetualness, persistence, persistency, pervasiveness, ponderability, predictability, purity, quiescence, relative density, reliability, resistance, restiveness, rigidity, rootedness, sang-froid, secureness, security, selfsameness, simplicity, singleness, singularity, solidarity, solidification, solidness, solvency, soundness, specific gravity, spissitude, stability, stable equilibrium, stable state, standing, stasis, staunchness, steadfastness, steadiness, steady nerves, steady state, steeliness, stoniness, stoutness, strength, sturdiness, substance, substantiality, substantialness, tangibility, temper, thickness, thoroughness, torpor, totality, toughness, trustworthiness, ubiquity, unchangeability, unchangingness, undeflectability, undividedness, unerringness, unification, uniformity, unindebtedness, uniqueness, unity, universality, univocity, unmovability, unshakable nerves, unshakableness, unyieldingness, validity, vis inertiae, viscidity, viscosity, viscousness, weight, wholeness