Pennyweight
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
A troy weight which weighs twenty-four grains, or one-twentieth part of an ounce. PENSA "(Law Lat. from Lat. pendere, to weigh). In Old English Law. A weight. Ad pensam, by weight. The ancient way of paying into the exchequer as much money for a pound of sterling as weighed twelve ounces troy.
Lowndes' Essay upon Coin, 4; Cowell.
This was distinguished from payment de numero, by count. In Old Records. A wey (weigh) of P E N S I O ( Lat. from pewdere ). In the Civil Law. A payment, properly, for the use of a thing. Calv. Lex. A rent; a payment for the use and occupation of another's house. Calv. Lex.