A macroregion is a geopolitical subdivision that encompasses several traditionally or politically defined regions. The meaning may vary, with the common denominator being cultural, economical, historical or social similarity within a macroregion. The term is often used in the context of globalization.
Other uses
The term "macroregion" may be also used in the context of natural regions, like in Slovenia.
References
Macroregion Wikipedia(Text) CC BY-SA