IPA: /ˌbaɪdaɪˈlɛktəlɪzəm/
KK: /baɪdaɪˈlɛktəlɪzəm/
The ability to use two different forms of a language, especially in speaking or writing, often involving a standard and a nonstandard version.
Her bidialectalism allows her to communicate effectively with both her friends and her teachers.
Bidialectalism → It is formed from "bi-" (meaning two) and "dialect" (from Greek "dialektos", meaning conversation or language variety) and "-alism" (a suffix indicating a practice or condition). The word refers to the practice or condition of using two dialects.
Think of 'two' ('bi-') languages or varieties of speech ('dialect') that someone can use — that's what bidialectalism means.
No commonly confused words.