MSAW

E-MSAW is a FAA Acronym for: En-Route Automated Minimum Safe Altitude Warning
Related Definitions from Aviation Glossary
GSA
GHA
Military Operations Area (MOA)
ATA - Air Transport Association
MRO ...

E-MSAW-
(See EN ROUTE MINIMUM SAFE ALTITUDE WARNING.)
ENGINEERED PERFORMANCE STANDARDS- A mathematically derived runway capacity standard.

Minimum Safe Altitude (MSAW) Warns ATC without regard to other terrain.
Minimum En route Altitude (MEA) is arc around navaid.
Emergency Safe Altitude (ESA) is used by military.
Minimum Off-Route Altitude (MORA) by Jeppesen grids.

Minimum Safe Altitude Warning (MSAW): a tool that alerts the controller if an aircraft appears to be flying too low to the ground or will impact terrain based on its current altitude and heading.

See also: Heading, Air route, Controller, Terminal area, Air traffic