1. a person who assigns numbers to things or counts items
2. a device or tool used for numbering or counting

Examples

• The numberer at the marathon finish line recorded each runner’s time.
• She worked as a numberer in the warehouse, cataloging inventory.
• The automatic numberer stamped sequential numbers on each document.
• The ticket numberer helped organize the raffle entries.
• As the official numberer, he kept track of all participants.
• The mechanical numberer made the filing process much faster.