Definitions

1. noun

The state or quality of being solid; stability or firmness of structure or character.

“The solidity of the building withstood the earthquake.”

2. noun

The quality of being sound or valid in principle or fact.

“The solidity of her argument convinced the audience.”

3. noun

A state of being free from defect or imperfection.

“The solidity of the design made the product a huge success.”