Definition of Rule Britannia in US English:

Rule Britannia

noun

  • A patriotic song which frequently used to be sung on public occasions in Britain and its colonies.

adjective

  • Expressing the sentiments of the song Rule, Britannia; characteristic of British imperialism; characterized by British patriotism or nationalism.

Origin

Mid 18th century. From Rule, Britannia, the title of a popular patriotic song, originally celebrating a new British identity following the Act of Union between England and Scotland of 1707; the song was written by the Scottish poet J. Thompson and set to music by T. A. Arne (an Englishman) for his opera Alfred, a Masque, which expressed opposition to the politics of R. Walpole.

Pronunciation

Rule Britannia

/ˌruːl brɪˈtanjə/