twelfth       
 ordinal number uk/twelfθ/ us/twelfθ/
 第十二(的)
12th written as a word
  Our next meeting is on the twelfth (of May). 我们下一次会议是在(五月)十二日。 
 twelfth       
noun [ C ] uk/twelfθ/ us/twelfθ/
 十二分之一
one of twelve equal parts of something
  An inch is one twelfth of a foot. 一英寸等于十二分之一英尺。