an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
a formal public statement; "the government made an announcement about changes in the drug war"; "a declaration of independence"
a public statement about something that is happening or going to happen; "the announcement appeared in the local newspaper"; "the promulgation was written in English"