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roundness (n.)

"state of being round or circular," late 14c., from round (adj.) + -ness.

Roundness applies with equal freedom to a circle, a sphere, a cylinder, or a cone, and, by extension, to forms that by approach suggest any one of these : as, roundness of limb or cheek. Rotundity now applies usually to spheres and to forms suggesting a sphere or a hemisphere : as, the rotundity of the earth or of a barrel ; rotundity of abdomen. [Century Dictionary]

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Definitions of roundness

roundness (n.)
the fullness of a tone of voice;
there is a musky roundness to his wordiness
Synonyms: rotundity
roundness (n.)
the quality of being round numbers;
he gave us the results in round numbers, but their roundness didn't affect the point he was making
roundness (n.)
the property possessed by a line or surface that is curved and not angular;
roundness (n.)
the bodily property of being well rounded;
Synonyms: plumpness / embonpoint
From wordnet.princeton.edu