1. one of three equal parts; a third
Usage: archaic
2. a historical administrative division in some English counties, being one of three parts
Usage: historical

Examples

• The estate was divided into three trithings among the heirs.
• Each trithing of the county had its own local court.
• The ancient trithing system predated modern administrative boundaries.
• Historical records show the trithing was responsible for local taxation.
• The old trithing boundaries can still be traced on medieval maps.