Using one hearing aid instead of two.
Monaural
Referring to just one ear, as opposed to binaural—both ears.
Moderately Severe Hearing Loss
A hearing loss ranging between 56 and 70 decibels (dB).
Moderate Hearing Loss
A hearing loss ranging between 41 and 55 decibels (dB).
MML
see Minimum Masking Level.
MM
A colloquial abbreviation for Meniere’s disease from the Latin “Morbus Meniere” meaning “disease of Meniere”. (See Meniere’s Disease.)