Word · Frequency #19740
thirtieth
第三十
三十分之一
In use
This is the thirtieth time I have told you to clean your room.
She finished thirtieth in the marathon, just ahead of her friend.
He celebrated his thirtieth birthday with a small party.
the thirtieth + noun
序数词作定语，表示“第三十个……”，前面常用定冠词the。
This is the thirtieth year of the festival.
这是音乐节的第三十个年头。
the thirtieth of + month
表示日期时用“the thirtieth of + 月份”，口语中也常说“March the thirtieth”。
The meeting is on the thirtieth of March.
会议在3月30日举行。
one thirtieth of + noun
分数表达中，thirtieth可作名词，意为“三十分之一”。
One thirtieth of the land is used for farming.
这块地的三十分之一用于耕种。
Common mistakes
My office is on the thirty floor.My office is on the thirtieth floor.
楼层序号要用序数词，表示“第三十层”应说 thirtieth，而不用基数词 thirty。
He finished thirtith in the race.He finished thirtieth in the race.
thirtieth 的正确拼写是 t-h-i-r-t-i-e-t-h，中间是 ie 不是 i，词尾是 -th，不能漏写 e。
Two thirtieth of the class were absent.Two thirtieths of the class were absent.
thirtieth 作“三十分之一”表示复数时，要加 -s 变为 thirtieths，不能说 two thirtieth。
Connections
Collocations
- thirtieth birthday
- 三十岁生日
- She celebrated her thirtieth birthday with a big party.她举办了一个盛大的聚会来庆祝她的三十岁生日。
- thirtieth anniversary
- 三十周年纪念
- The company is celebrating its thirtieth anniversary this year.公司今年庆祝成立三十周年。
- thirtieth floor
- 第三十层
- Their office is on the thirtieth floor.他们的办公室在第三十层。
- thirtieth place
- 第三十名
- He finished in thirtieth place in the race.他在比赛中获得第三十名。
- the thirtieth of May
- 五月三十日
- The event will take place on the thirtieth of May.活动将于五月三十日举行。
- one thirtieth
Learner notes
Memory Tip
想象第三十名选手把 thirty 的 y 改成 ie，再冲过终点线，成了 thirtieth（第三十）。
Context & Register
语域：neutral 常见场景：日期表达、排列顺序、分数描述 thirtieth 用作序数词或分数时，通常用于日期、排列顺序或数量分配等场景，属于中性表达，在口语和书面语中都较常见。
Pronunciation & Spelling
All six ordinals share the spelling ending -tieth, and their final unstressed syllables sound similar (/tiəθ/). They do not fully rhyme with thirtieth because their stressed vowels differ; also, do not confuse thirtieth with thirteenth (/θəːˈtiːnθ/), which has a different final sound and meaning.
Usage priority
Collins 词频等级为 4，建议结合例句记忆，而不是只背中文释义。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.