1. a system of money in general use in a particular country
2. the fact or quality of being generally accepted or in use
3. the time during which something is current or valid

Examples

• The euro is the official currency of many European countries.
• She exchanged her dollars for local currency at the airport.
• Digital currencies like Bitcoin are becoming more popular.
• His ideas gained currency among young voters.
• The rumor had wide currency in the small town.
• The passport has currency for ten years.
• That theory no longer has currency in scientific circles.