trethingEtymologyFrom Welsh treth (“an allowance, contribution, tribute, or tax”), trethu (“to rate or tax”).trething means A tax; an impost. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA tax; an impost.“All counties, hundreds, wapentakes and trethings , shall stand at the old ferm, without any encrease, except in our Demesne Lands”