Definition of "platinum"

The chemical element with atomic number 78 and symbol Pt; a dense, malleable, ductile, highly unreactive, silverish-white transition metal of great value.  examples

A whitish grey colour, like that of the metal.  examples

(music) A single or album that has achieved platinum sales, i.e. over 1 million or 2 million.  examples

(medicine, sometimes, elliptically) A platinum-based drug: a platin.  examples

Of a whitish grey colour, like that of the metal.  examples

Of a musical recording that has sold over one million copies (for singles), or two million (for albums).  examples

Very expensive, or of very high quality  examples

(computer games) to reach platinum level in a game  examples