1. (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.
2. (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, truths, or opinions.
3. (n.) The solid contents of a body; volume; amount of enclosed space.
Thesaurus Entries
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
