fineness

The English word “fineness” has 3 meanings listed here.

noun

The quality or degree of being fine.
The ratio, in a precious metal, of the primary metal to any additives or impurities.
The ratio of length to width of a ship, aircraft or rocket

From fine + -ness.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.