from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Software that serves as an intermediary between systems software and an application.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. software that functions at an intermediate layer between applications and operating system or database management system, or between client and server
- n. Networking software/hardware that is deployed in the middle of, as opposed to serviced by, a packet network to enhance or provide some network function, such as caching, filtering, or firewall functionality.
middle + -ware (Wiktionary)