Democracy is a political form of government where governing power is derived from the people, either by direct referendum (direct democracy) or by means of elected representatives of the people (representative democracy). The term comes from the Greek: δημοκρατία - (dēmokratía) "rule of the people", which was coined from δῆμος (dêmos) "people" and κράτος (krátos) "power", in the middle of the fifth-fourth century BC to denote the political systems then existing in some Greek city-states, notably Athens following a popular uprising in 508 BC. Even though there is no specific, universally accepted definition of 'democracy', equality and freedom have been identified as important characteristics of democracy since ancient times. These principles are reflected in all citizens being equal before the law and having equal access to power. For example, in a representative democracy, every vote has equal weight, no restrictions can apply to anyone wanting to become a representative, and the freedom of its citizens is secured by legitimized rights and liberties which are generally protected by a constitution.