ETYM Ideo- + -logy: cf. French idéologie.
Imaginary or visionary theorization.
Science of ideas; theory, especially impractical; body of ideas on a subject or of a class, race, political party, etc.
Set of ideas, beliefs, and opinions about the nature of people and society, providing a framework for a theory about how people should live, as well as how society is or should be organized. A nation's ideology is usually reflected in the political system it creates.