The term register was first used in 1956 by Thomas Bertram Reid, a linguist. By it he meant the style of language used according to context, social status, occasion and the speaker. This article traces the use of the terms 'register' and 'label' in English and Urdu dictionaries. With a special reference to the dictionaries of Urdu compiled in the 19th century, the article enlists some 'registers' and 'labels' used according to the specific contexts, the speakers and the audience hailing from different social backgrounds. It takes into account Urdu's authentic dictionaries such as Farhang-e-Aasifiya, Ameer-ul-lughaat and Makhzan-ul-muhaavraat etc.