noun. A gap where there is a vacuum (not actually air), used to reduce power consumption in microelectronics.

"Armonk, NY - 03 May 2007: Today's announcement by IBM (NYSE: IBM) of a major breakthrough in chip design -- called 'airgap' -- bookends a decade of innovation from IBM Labs that have transformed the IT industry with new materials and design architectures to build smaller, more powerful and energy efficient chips."

Aira  airman  airway