Section 2(1)(k) in Tamil Nadu Laws (Special Provisions) Act, 2007
(k)"unauthorised development" means use of any land or any building or construction of any building carried out,-(i)in deviation from any planning permission or building permit; or(ii)without obtaining any planning permission or building permit; or(iii)in contravention of the land use zoning under the Master Plan or any approved detailed development plan; or(iv)in contravention of the Development Control Rules for Chennai Metropolitan Planning Area, building rules, regulations, bye-laws applicable to areas within the Chennai Metropolitan Planning Area;