n.第九十;九十分之一;
adj.第九十的;九十分之一的;
例句:
This is like the ninetieth time I called you!
我都给你打了九十几遍电话了!
Today is the ninetieth anniversary of our dead Grandpa.
今天是爷爷90岁冥寿的日子.
She is like the ninetieth person on the list.
她好像是名单上的第九十位.