1
the hundredth
指位置时，hundredth 作名词，通常与 the 连用，后面常接不定式或 of 短语。
She was the hundredth to arrive.
她是第一百个到达的人。
百分之一
先理解核心含义，再看它在真实句子里的用法。
百分之一
One of a hundred equal parts of a whole.
She was the hundredth to arrive.
她是第一百个到达的人。
处于第一百位的人或物。
The person or thing in the hundredth position.
整体的一百分之一。
One of a hundred equal parts of a whole.
He was the hundredth to finish the marathon.
他是第100个完成马拉松的人。
The hundredth on the waiting list got the last ticket.
等候名单上的第100位获得了最后一张票。
She was the hundredth to be hired this year.
她是今年第100个被录用的人。
指位置时，hundredth 作名词，通常与 the 连用，后面常接不定式或 of 短语。
She was the hundredth to arrive.
她是第一百个到达的人。
表示“百分之一”时，可用 one hundredth of 或 a hundredth of，后面接整体。
One hundredth of the city's population volunteered.
该市人口的百分之一参加了志愿活动。
在数学表达中，to the nearest hundredth 指保留到小数点后第二位（百分位）。
Round 3.14159 to the nearest hundredth.
把3.14159四舍五入到百分位。
Not this
The gap was a hundred of a second.
Use this
The gap was a hundredth of a second.
这里要表示‘百分之一秒’，名词性分数单位是 hundredth，不是基数词 hundred。hundred 单独意为‘一百’，所以要在 hundred 后加 -th 变成 hundredth。
Not this
Three hundredth of the students were absent.
Use this
Three hundredths of the students were absent.
hundredth 表示‘等份之一’时是可数名词；分子为 three 时，单位词要用复数 hundredths。单数 hundredth 只表示‘一分之一’，不能与 three 搭配。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
百分之一秒
The photo finish showed a difference of a hundredth of a second.
终点照片显示差距为百分之一秒。
百分之一
One hundredth of the students received a perfect score.
百分之一的学生得了满分。
精确到百分位
Round 3.14159 to the nearest hundredth.
将3.14159四舍五入到百分位。
一个百分点的百分之一
The margin of error is a hundredth of a percent.
误差幅度为一个百分点的百分之一。
百分之一英寸
The shim is a hundredth of an inch thick.
这个垫片厚百分之一英寸。
Use hundredth naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
hundred（百）加上序数后缀 th，就像 tenth 一样：既是第一百个，也是分成百份后的一份。
语域：neutral 常见场景：order/position、fractions/measurement hundredth 作名词时通常表示“第一百个”或“百分之一”，多用于数学、测量或按顺序编号的语境。口语中更常见 one hundredth 的说法，但在正式或书面表达中也经常使用，整体属于中性偏正式。
None of these words rhymes with hundredth (/ˈhʌndrədθ/): the stressed vowel and following sounds differ. Hundred is the closest spelling/sound match but lacks the final /θ/; thousandth shares the ordinal -th but has a different vowel and ending; breadth and width have the same final /dθ/ cluster but their stressed vowels do not match. Useful lookalikes to pronounce carefully.
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.