IPA: /ˈmeɪnˌlændər/
KK: /ˈmeɪnˌlændər/
A person who lives on the mainland, especially in contrast to those living on islands or in other regions.
The mainlander shared stories about life in the city with the islanders.
Mainlander → It is formed from "mainland" (from Old English "mǣnland", meaning the principal land as opposed to islands) and "-er" (meaning a person who). A mainlander is a person who lives on the mainland as opposed to an island.
Think of someone who lives on the 'mainland' — that's what a 'mainlander' is, a person from the main land.