A dictatorship is a government or a social situation where one person makes all the rules and decisions without input from anyone else.
Dictatorship implies absolute power — one person who takes control — of a political situation, a family, a classroom or even a camping expedition. In government, a dictatorship leaves no room for input from anyone who is not the top guy or gal. The noun comes from the late 14th century Latin word, dictare, which means to "repeat or say often." In a dictatorship, one person keeps repeating the same command: "My way or the highway."