1. a person who calculates or computes
2. a book or table used for making calculations
Usage: historical

Examples

• The accountant was known as a skilled reckoner who could do complex math in his head.
• She used an old reckoner to figure out the compound interest.
• The merchant kept a reckoner handy for quick calculations.
• Before calculators, people relied on printed reckoners for mathematical tables.
• He was considered the best reckoner in the village for settling disputes about money.
• The old reckoner contained multiplication tables and conversion charts.