Plain English Meaning
It's the modern 'glass cockpit' setup, where the old round dial instruments are replaced by computer screens that show all the same flight information electronically.
Full Definition
A flight instrument display system that replaces traditional mechanical (analog) cockpit gauges with electronic displays. EFIS typically presents primary flight information — attitude, airspeed, altitude, vertical speed, heading, and navigation data — on one or more electronic screens driven by digital data from the aircraft's and computers.