Black's Law Dictionary (2nd edition)dictionaries

Trithing

In Saxon law. one of the territorial divisions of England, being the third part of so county, and comprising three or more hundreds, wlthin the trithlng there was a court held (called “trlthlng-mote”) which resembled the court-leet, but was in-ferior to the county court

Source: Black’s Law Dictionary 2nd Ed (1910)