[determiner], [pronoun], [adjective], [adverb] [not gradable], nounthe eighth batsman in the teamthe eighth of December/December the eighthHe was/finished eighth in the race.Cut the cake into eighths (= eight equal parts).Eighth note is US for quaver (MUSICAL NOTE).
EIGHTH
Meaning of EIGHTH in English
Cambridge English vocab. Кембриджский английский словарь. 2012