“An ideology is a set of beliefs or philosophies attributed to a person or group of persons, especially those held for reasons that are not purely epistemic,[1][2] in which "practical elements are as prominent as theoretical ones."[3] Formerly applied primarily to economic, political, or religious theories and policies, in a tradition going back to Karl Marx and Friedrich Engels, more recent use treats the term as mainly condemnatory.[4]”
The term was coined by Antoine Destutt de Tracy, a French Enlightenment aristocrat and philosopher, who conceived it in 1796 as the "science of ideas" to develop a rational system of ideas to oppose the irrational impulses of the mob. In political science, the term is used in a descriptive sense to refer to political belief systems.[4]----from Wikipedia
从维基中将前篇没有涉及的，关键词组，重新组合，陈列如下：
1.a set of political belief systems，
一套系统性的政治信仰，例如中国人最熟悉的，共产主义；
2."practical elements are as prominent as theoretical ones."，
