Meaning of mainland

main•land

1. the principal land of a country, region, etc., as distinguished from adjacent islands or a peninsula: the mainland of Greece.
2. (in Hawaii) the 48 contiguous states of the U.S.

Main•land

1. the largest of the Shetland Islands. 18,268; ab. 200 sq. mi. (520 sq. km).
2. Pomona (def. 3).