/ ˈaɪdiəlɒg; ˈɪd-; NAmE -lɔːg; -lɑːg/ (also ideolo·gist / ˌaɪdiˈɒlədʒɪst; NAmE -ˈɑːl-/) noun
( formal , sometimes disapproving ) a person whose actions are influenced by belief in a set of principles (= by an ideology )
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WORD ORIGIN
early 19th cent.: from French idéologue ; see also ideology .