† assecuˈrationObs.rare—1. [ad.med.L. assēcūrātiōn-em, n. of action f.assēcūrāre: see next and -ation.] The action of making sure; assurance. a1656Bp. Hall Rem. Wks. (1660) 268 Such a fiduciall persuasion as cannot deceive us, nor be liable to falsehood. But how far reaches this assecuration?