Tractatus Logico-Philosophicus | Tractatus Politicus | Tractatus de Intellectus Emendatione | Wittgenstein Tractatus | ''Tractatus de Ponderibus et Mensuris'' |
The earliest known occurrence of the word "avoirdupois" (or some variant thereof) in England is from a document entitled Tractatus de Ponderibus et Mensuris or Treatise on Weights and Measures.
Charles Moore Watson (1844–1916) proposes an alternate etymology: The Assize of Weights and Measures (also known as Tractatus de Ponderibus et Mensuris), one of the statutes of uncertain date from the reign of either Henry III or Edward I, thus before 1307, specifies "troni ponderacionem"—which the Public Record Commissioners translates as "troy weight".