MEL
(mel)
(acoustics) A unit of pitch, equal to one-thousandth of the pitch of a simple tone whose frequency is 1000 hertz and whose loudness is 40 decibels above a listener's threshold.
[Etymology: melody] acoustics, music USA 1951 A linear scale for subjective pitch, referenced to 1 000 mel for a pure tone of 1 kHz.
[Stevens S. S., Volkmann J., Newman E. B. J. Acoust. Soc. Amer. Vol. 8, 185-90 (1937)]
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McGraw-Hill Dictionary of Aviation:
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minimum equipment list
A list which provides for the operation of aircraft, subject to specified conditions, with particular equipment inoperative, prepared by an operator in conformity with, or more restrictive than, the master minimum equipment list (MMEL) established for the aircraft type (ICAO).
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