Colony (n) is a country or area under the full or partial political control of another country and occupied by settlers from that country.
Colonisation (n) is a process by which a central system of power dominates the surrounding land and its components.
By those definitions, neither India nor any region of it is a colony of a dominant society, community or country anymore. However, India and its population is no longer a nation that is defined by its physical presence alone either. We are all living our lives within the geographical boundaries of India and within the virtual boundaries