Definition of fashionista noun from the Oxford Advanced Learner's Dictionary

 

fashionista

 noun
noun
BrE BrE//ˌfæʃnˈiːstə//
 
; NAmE NAmE//ˌfæʃnˈiːstə//
 
 
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(used especially in newspapers) a fashion designer, or a person who is always dressed in a fashionable way Word Origin 1990s: from fashion + -ista.
See the Oxford Advanced American Dictionary entry: fashionista