noun
( abbr. AU ) ( astronomy ) a unit of measurement equal to 149.6 million kilometres, which is the distance from the centre of the earth to the sun
noun
( abbr. AU ) ( astronomy ) a unit of measurement equal to 149.6 million kilometres, which is the distance from the centre of the earth to the sun
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005