IPA: /ˈfaɪnəs/
KK: /ˈfaɪnəs/
The quality of being very thin or delicate, often used to describe the purity of precious metals.
The jeweler checked the fineness of the gold before making the ring.
Fineness → It is formed from "fine" (from Old French *fin*, meaning delicate or subtle) and "-ness" (meaning the state or quality of). The word "fineness" refers to the quality of being fine or delicate.
Think of something that is 'delicate' or 'subtle' ('fine') and how that quality is described by the suffix '-ness', which indicates a state or quality.