REICHSTAG Meaning of REICHSTAG in English [ 'rʌɪxsˌtα:g , 'rʌɪks- ]■ noun the main legislature of the German state under the Second and Third Reichs.OriginGer., from Reichs 'of the empire' + Tag 'assembly'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004