Definition of "avoirdupois" in English

noun

1. (historical) The official system of weights used in the UK between 1856 and 1963. It had been the customary system in London since 1300.

2. (historical) The official system of weights used in the USA between 1866 and 1959.

3. (chiefly humorous) Weight; heaviness.

4. (obsolete) Merchandise.