An
option contract that may only be
exercised on certain days. For example, if one
buys a Mid-Atlantic
call giving him/her the right to buy
shares in X expiring on the final Friday in March, the call may only be exercised on certain days, usually one day per month. The term "Mid-Atlantic" comes from the fact that it combines features of a
European option, which may only be exercised on the expiration date, and an
American option, which may be exercised at any time. A Mid-Atlantic option is also called a Bermudan option.