coin ‧ age /ˈkɔɪnɪdʒ/ BrE AmE noun
1 . [uncountable] the system or type of money used in a country:
the gold coinage of the Roman empire
2 . [countable] a word or phrase that has been recently invented:
The phrase ‘glass ceiling’ is a fairly recent coinage.
3 . [uncountable] the invention of new words or phrases
4 . [uncountable] the making of coins