( formal )
1.
claiming to support a particular set of ideas :
They fought the election under the banner of 'No new taxes'.
2.
as part of a particular group or organization :
Troops are in the country under the banner of the United Nations.
( formal )
1.
claiming to support a particular set of ideas :
They fought the election under the banner of 'No new taxes'.
2.
as part of a particular group or organization :
Troops are in the country under the banner of the United Nations.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005