Word · CEFR B2 · Frequency #1793
index
指数；指标
a number or ratio derived from observed facts that shows relative changes over time
- 1.
a numerical scale used to compare variables with one another or with some reference number
用于比较变量或参考数值的数值标度
- 2.
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
从一系列观测事实中得出的数值或比率,可揭示随时间变化的相对变化
- 3.
a mathematical notation indicating the number of times a quantity is multiplied by itself
表示一个量自乘次数的数学符号
标度；幂指数；用于比较变量或参考数值的数值标度；从一系列观测事实中得出的数值或比率,可揭示随时间变化的相对变化；表示一个量自乘次数的数学符号
In use
The consumer price index rose by two percent last year.
Economists compare several indices to judge economic health.
Your test score is an index of your progress in this course.
index of [noun phrase]
表示某物的索引列表或目录。
The index of the book is organized alphabetically.
这本书的索引是按字母顺序排列的。
a/an [adjective] index of [noun phrase]
表示某种度量或指标，形容词描述其性质。
The consumer price index is a reliable index of inflation.
消费者价格指数是通货膨胀的可靠指标。
Common mistakes
Please check the index at the beginning of the book.
Connections
Collocations
- subject index
- 主题索引
- Use the subject index to find articles on global warming.使用主题索引查找关于全球变暖的文章。
- price index
- 价格指数
- The consumer price index rose by 0.5% last month.上个月消费者价格指数上涨了0.5%。
- index card
- 索引卡
- She wrote each vocabulary word on an index card.她把每个词汇写在一张索引卡上。
- index fund
- 指数基金
- Investing in an index fund is a low-cost way to track the market.投资指数基金是追踪市场的低成本方式。
- index finger
- 食指
- He pointed at the map with his index finger.他用食指指着地图。
- index number
Learner notes
Memory Tip
index 就像食指，指向书中的信息。
Context & Register
语域：neutral 常见场景：academic、finance、statistics 作为名词表示‘指数’时，通常用于学术、金融或统计领域，例如价格指数、经济指数等。在非正式场合较少使用。
Pronunciation & Spelling
All listed words share the spelling ending 'ex' and the final /ɛks/ sound. Note that 'vex', 'hex', and 'flex' are one-syllable words stressed on the vowel, while 'vortex', 'reflex', and 'convex' have stress on the first or second syllable. The target 'index' stresses the first syllable but also ends with /dɛks/.
High-value vocabulary
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Usage priority
Collins 词频等级为 3，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 AI_FALLBACK, DICTIONARY_API_DEV, ECDICT, WORDNET.