/ˌaɪdiˈɒlədʒɪst/
NOUN
A person who studies, formulates, promotes, or advocates a particular system of ideas, beliefs, or principles, especially in politics, philosophy, or social affairs.
A person who develops, explains, or promotes political or social ideas and principles that influence policies, movements, or institutions.
A person who actively supports, promotes, or defends the principles and beliefs of a particular political, social, or philosophical movement.
A person who strongly adheres to and promotes a particular doctrine, ideology, or established system of beliefs.
NOUN
A person who systematically examines, interprets, or researches ideologies and their influence on politics, society, culture, and intellectual history.
A researcher or intellectual who studies the origins, development, structures, and effects of different systems of ideas and beliefs.