dep·re·cate / ˈdepriˌkāt/ • v. [tr.] 1. express disapproval of: [as adj.] (deprecating) he sniffed in a deprecating way. 2. another term for depreciate (sense 2): he deprecates the value of children's television.DERIVATIVES: dep·re·cat·ing·ly adv.dep·re·ca·tion / ˌdeprəˈkāshən/ n.dep·re·ca·tive / -ˌkātiv/ adj.dep·re·ca·tor / -ˌkātər/ n.

deprecate pray against; plead for the avoidance of. XVII. f. pp. stem of L. dēprecārī, f. DE- 2 + precārī PRAY; see ATE3.
So deprecation XV. — L. deprecatory XVI. — late L.