11th。是原来单词的缩写,first 缩写成1st,second缩写成2nd,。。。第十一是eleventh 所以所写成11th。
eleventh 英[ɪˈlevnθ] 美[ɪˈlevnθ]
ord. 第十一;
short 十一分之一;
n. 第十一; 十一分之一的第十一; (每月的) 第十一日; 十一分之一;
[例句]We were working on the eleventh floor.
我们在11层办公。
扩展资料:
1~30序数词
first、second、third、fourth、fifth、sixth、seventh、eighth、ninth、tenth;
eleventh、twelfth、thirteenth、fourteenth、fifteenth、sixteenth、seventeenth、eighteenth、nineteenth、twentieth;
twenty-first、twenty-second、twenty-third、twenty-fourth、twenty-fifth、twenty-sixth、twenty-seventh、twenty-eighth、twenty-ninth、thirtieth。
1~30的序数词的缩写如下:
1st , 2nd , 3rd , 4th , 5th , 6th, 7th , 8th ,9th ,10th;
11th,12th,13th,14th,15th,16th,17th,18th,19th,20th;
21st , 22nd , 23rd , 24th , 25th , 26th, 27th , 28th ,29th ,30th。