User blog comment:7-45 Fire/YeahWinx (form) page has a flaw/@comment-31892545-20171125232113

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Let me attempt to answer your question: the word “Winx” is considered the name of the first form because Faragonda added the word to Alfea’s vocabulary at the end of the first season, meaning “the definition of a modern fairy” - hence, “Winx” as the name of the form was born. That’s also why this definition carries over to Aisha, because she joined Alfea and Winx is part of Alfea’s vocabulary.

Winx isn’t used for fairies of other schools because Alfea’s vocabulary doesn’t apply to them.