1. [late 19C–1910s] the Metropolitan Music Hall, London.
2. [late 19C+] the Metropolitan Railway, part of the London Underground system.
3. [late 19C+] (US, also Mett) the Metropolitan Opera House, New York; also attrib.
4. [1940s+] (also Mets) the Metropolitan Police, serving London.
5. [1940s+] the Meteorological Office, responsible for weather forecasting; usu. as the Met Office; thus Met man, a weather forecaster.