au·then·ti·cate / ôˈ[unvoicedth]entiˌkāt/ • v. [tr.] prove or show (something, esp. a claim or an artistic work) to be true or genuine: they were invited to authenticate artifacts from the Italian Renaissance. ∎ validate: the nationalist statements authenticated their leadership among the local community. ∎ [intr.] Comput. (of a user or process) have one's identity verified.DERIVATIVES: au·then·ti·ca·tion / ôˌ[unvoicedth]entiˈkāshən/ n.au·then·ti·ca·tor / -ˌkātər/ n.