In Saxon law. The estimation or valuation of the head; the price or value of a man. By the laws of Athelstan, the life of every man not excepting that of the king himself, was estimated at a certain price, which was called the were, or wstimatio capitis. Crabb, Eng. Law, c. 4. 2Estimatio prseteriti delicti ex post remo facto nnuqnam crescit. The weight of a past offense is never increased by a subsequent fact. Bacon.