Under Article 120, Constitution of India 1950, Notwithstanding anything in Part XVII, but subject to the provisions of article 348, business in Parliament shall be transacted in Hindi or in English

Provided that the Chairman of the Council of States or Speaker of the House of the People, or person acting as such, as the case may be, may permit any member who cannot adequately express himself in Hindi or in English to address the House in his mother tongue. In both the Houses, arrangements are made for simultaneous translation.

Though English was to be discontinued as a floor language after the expiration of fifteen years from the commencement of the Constitution (that is, in 1965), the Official Languages Act (1963) allowed English to be continued along with Hindi.