Lewis & Short

mensūro, 1, v. a. [mensura],

  1. I. to measure (post-class.): fossa mensuratur, Veg. Mil. 1, 25; Gromat. Vet. p. 232, 9: fines, Hilar. in Psa. 15, 8: longitudinem, Vulg. Ezech. 45, 3; 48, 30 al.
  2. II. Trop., to measure, estimate: suas opes viresque suorum, Coripp. Laud. Just. 3, 372.
    Hence, mensūratē, adv., by measurement, Cassiod. in Psa. 69, 5.