Definition
MINIMUM FRICTION LEVEL
The friction level specified in AC 150/5320‐12, Measurement, Construction, and Maintenance of Skid Resistant Airport Pavement Surfaces, that represents the minimum recommended wet pavement surface friction value for any turbojet aircraft engaged in LAHSO. This value will vary with the particular friction measurement equipment used.
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).