名詞 eighteenth:

1. position 18 in a countable series of things

形容詞 eighteenth:

1. coming next after the seventeenth in position
   同義詞：18th

1. In the Eighteenth Century, the clergy, like the nobility and gentry, often rode to hounds.
   在18世紀(jì)，神職人員跟貴族和上流社會(huì)人士一樣，常常騎馬打獵。
2. This cave was used by smugglersin the eighteenth century.
   這個(gè)洞穴是十八世紀(jì)走私的人使用的。
3. I took the elevator to the eighteenth floor.
   我坐電梯上了第十八層。
4. The writer of the book lived in the eighteenth century.
   這本書的作者生活在十八世紀(jì)。

eight.eenth

n.（名詞）
The ordinal number matching the number 8 in a series.
第十八：在一列中對(duì)應(yīng)于8的序數(shù)
One of 8 equal parts.
十八分之一：十八個(gè)相等部分之一

【引伸】
eighteenth.
adv.（副詞）
adj.（形容詞）