# sphericity

> English word · Noun

## Definitions
1. The quality of being spherical, being a sphere.
2. The ratio of the surface area of a given particle to the surface area of a sphere with the same volume.

## Etymology
From spheric + -ity. In the geometrical sense, defined by the geologist Hakon Wadell in 1935.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/sphericity