Definitions for "High memory area"
In an IBM-compatible compter, the first 64K of extended memory above the 1 MB limit of 8086 and 8088 addresses. Programs that conform to the extended memory specification can use this memory as an extension of conventional memory although only one program can use or control HMA at a time; DOS, Microsoft Windows, or an application. If you load DOS into the HMA, you can recover approximately 50K of conventional memory for use by your applications.
See HMA.
The first 64KB of extended memory.