rotundity
/ˌroʊtˈʌndɪti/Definitions
1. noun
The state or quality of being round or plump; fullness of figure
“Her rotundity was a testament to her love of rich, decadent desserts.”
2. noun
The quality of being voluminous or swollen; grandeur, magnificence
“The rotundity of the cathedral’s dome left the tourists in awe.”