What does solidity mean?
Solidity denotes firmness, strength, or stability. In physical contexts, it describes the quality of a material or structure as solid, dense, or well supported; for example, engineers may assess a building's structural solidity. In figurative use, solidity indicates that an argument, position, institution, organization, or financial condition is firmly established and dependable. The phrase financial solidity, for instance, refers to soundness in assets, earnings, reserves, and overall financial stability. Solidity is related in origin to solid, but it is more abstract than that adjective and more focused than the general idea of strength. It also differs from solidarity: solidity concerns the firmness or stability of something, whereas solidarity concerns unity and mutual support within a group. Together, these uses make solidity especially useful when discussing whether a physical structure, practical argument, or institutional position can withstand pressure.
nounSolidity is the quality of being solid, firm, or strongly supported. Figuratively, it means stability, soundness, or firmness of an argument, institution, financial position, or other arrangement.
- The quality of being solid, firm, dense, or physically strong.
- The firmness, stability, or soundness of an argument, position, institution, organization, or financial condition.
"The bridge was redesigned to improve its structural solidity."
"The engineers questioned the solidity of the old supporting walls."
"The company demonstrated its financial solidity by maintaining substantial reserves."
The plural is grammatically possible but uncommon; the uncountable form is normally preferred.
"The study compares the differing solidities of stone, timber, and steel."
Solidity and solidarity share the same Latin root, but one describes strength while the other describes collective unity.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does solidity come from?
Solidity derives from Latin soliditas, a noun meaning firmness or solidity, formed from solidus, meaning solid, whole, or compact. The word entered English in the 17th century and developed both physical and figurative uses. Latin solidus also underlies related English words such as solid, solidify, consolidate, and solidarity.
Related word forms
How solidity is actually used
In figurative contexts, solidity often suggests that something is firmly established, dependable, and unlikely to change or fail. It is especially common in discussions of financial affairs, institutions, arguments, and physical structures.
Easily confused with solidity
Solidity refers to firmness or stability, whereas solidarity refers to unity or mutual support among a group of people.