Surveillance Verb Form. Definition of surveil. transitive verb. : to subject to surveillance. Перевод слова surveillance, американское и британское произношение, транскрипция covert surveillance — тайный надзор overt surveillance — гласный надзор under surveillance — под. More at vigilant. surveillance - traduction français-anglais.

A complete list of English irregular verbs, including meanings and verb conjugations for the base form, past simple UsingEnglish.com's Irregular Verbs List is one of the most comprehensive lists available.
Surveil is the verb form of Surveillance.
Using this definition, I would have to guess the the verbal form of suveillance is to observe. Surveillance is not a verb, so it does not have a past tense. This can include observation from a distance by means of electronic equipment, such as closed-circuit television (CCTV).