Mainland is a name given to a large landmass in a region (as contrasted with a nearby island or islands), or to the largest of a group of islands in an archipelago. Sometimes its residents are called "Mainlander.
OmegaWiki Dictionary
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mainland A large and continuous mass of land representing most of a region or a country but excluding outlying islands.
mainland A large piece of land as seen from the outlying islands belonging to the same political entity.
