Lewis & Short

exsē̆crātĭo (execr-), ōnis, f. [exsecror].

  1. I. Execration, malediction, curse: Thyestea ista exsecratio est: ut tu naufragio expulsus, etc., Cic. Pis. 19, 43: exierunt malis omnibus atque exsecrationibus, id. Sest. 33, 71; Vell. 2, 22; Tac. H. 3, 25; Plin. H. N. 19 praef. § 6; Suet. Claud. 12; Vulg. Psa. 58, 13 al.
  2. II. Transf.
    1. A. A solemn oath with an imprecation (if broken): aliquem exsecratione devincire, Cic. Sest. 7, 15: ubi fides? ubi exsecrationes? ubi dextrae complexusque? id. Verr. 2, 5, 40, § 104; id. Off. 3, 13, 55; Sall. C. 22, 2; Liv. 26, 25, 12; Tac. H. 4, 15; Vulg. 2 Par. 15, 15 al.
    2. B. An abomination, a thing to be execrated, Vulg. Levit. 18, 27.