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A platform or level ground surface on which heavy guns are mounted.
1. (Fortifications) the top of a rampart where guns are placed behind the parapet
2. (Fortifications) an embankment with a level top surface
[C16: from French, from Medieval Latin phrase terrā plēnus filled with earth]
terre•plein(ˈtɛrˌpleɪn, ˈtɛr ə-)
a level space behind the parapet of a rampart on which artillery was placed.