an event that occurs when something passes from one state or phase to another

markedly new or introducing radical change

a radical supporter of political or social revolution

change radically

change radically

fill with revolutionary ideas

a radical reform in China initiated by Mao Zedong in 1965 and carried out largely by the Red Guard; intended to eliminate counterrevolutionary elements in the government it resulted in purges of the intellectuals and socioeconomic chaos

the introduction of pesticides and high-yield grains and better management during the 1960s and 1970s which greatly increased agricultural productivity

the paradigm shift from the Ptolemaic model of the heavens, which described the cosmos as having Earth stationary at the center of the universe, to the heliocentric model with the Sun at the center of the Solar System.