plat ‧ i ‧ num /ˈplætənəm, ˈplætɪnəm/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Modern Latin ; Origin: Spanish platina , from plata ; ⇨ ↑ plate 1 ]
1 . a silver-grey metal that does not change colour or lose its brightness, and is used in making expensive jewellery and in industry. It is a chemical ↑ element : symbol Pt:
a platinum ring
2 . if a music recording goes platinum, at least a million copies of it have been sold:
Eight of Denver’s albums went platinum.
a platinum disc