Solidity is firmness and strength of structure. The solidity of the walls.
It is used of arguments and institutions as readily as of stone. Solidity is felt rather than measured, which is why the word does so much work.
1nounsolidityFirmness and strength of structure.
“The solidity of the old bridge shamed the new one.”
solidity is a quality.
From Latin soliditas, from solidus, firm, which also gives the soldier's pay called a solidus and so the word soldier.
Latin
soliditās
Middle French
solidité
English, today
solidity
From solid + ity, from Middle French solidité, from Latin soliditās.
Etymology from Wiktionary, CC BY-SA