CMN

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CMN means:

the IATA code of Casablanca Airport
the Chemins de fer des Montagnes Neuchâteloises , a former Swiss railway company integrated into the Transports Régionaux Neuchâtelois (TRN)
a Clark's melanocytic nevus cell nevus , a brownish skin lesion as a potential precursor of malignant melanoma
the French shipyard Constructions Mécaniques de Normandie in Cherbourg
the former Italian car manufacturer Costruzioni Meccaniche Nazionali
c ommon m ode n oise, see common mode interference

cmn stands for:

Mandarin Chinese (ISO-639-3 code)
Mandarin (language) (ISO-639-3 code)