Libra pensa
Defined in 3 dictionaries — Ballentine's (1916), Bouvier (1914), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
A weighed pound.
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
A pound of money by weight.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A pound of money by weight. It was usual in former days not only to sell the money, but to weigh it; because many cities, lords, and bishops, having their mints, coined money, and often very bad money, too, for which reason, though the pound consisted of 20 shillings, they weighed it Enc. Lond.
Defined under Libra in Black's Law Dictionary.