Definition of ideologue noun from the Oxford Advanced American Dictionary

 

ideologue

 noun
noun
NAmE//ˈaɪdiəˌlɔɡ//
 
, NAmE//ˈaɪdiəˌlɑɡ//
 
, NAmE//ˈɪdiəˌlɔɡ//
 
, NAmE//ˈɪdiəˌlɑɡ//
 
(also ideologist
NAmE//ˌaɪdiˈɑlədʒɪst//
 
, NAmE//ˌɪdiˈɑlədʒɪst//
 
)
(formal)(sometimes disapproving)
 
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a person whose actions are influenced by belief in a set of principles (= by an ideology )
See the Oxford Advanced Learner's Dictionary entry: ideologue