Word · Frequency #18526
rapidity
迅速；急速；快速
the quality or state of being rapid; speed or quickness
- 1.
speed, swiftness; the condition of being rapid
速度；迅速；快速的状态
- 2.
A measure of velocity relative to the speed of light; defined as artanh(v), where artanh is the hyperbolic arctangent, and v = speed (with c = speed of light = 1).
相对于光速的速度度量；定义为 artanh(v),其中 artanh 为双曲反正切,v 为速度(取光速 c=1)
- 3.
A measure of the velocity of a particle in a beam relative to the beam's axis
粒子束中粒子相对于束轴的速度度量
速度；迅速；快速的状态；相对于光速的速度度量；定义为 artanh(v),其中 artanh 为双曲反正切,v 为速度(取光速 c=1)；粒子束中粒子相对于束轴的速度度量；迅速；急速
In use
The rapidity of the company's growth surprised everyone.
She was impressed by the rapidity with which he finished the report.
The rapidity of technological change makes it hard to keep up.
the rapidity of sth
后接名词，表示某事物迅速的程度。
The rapidity of the change surprised everyone.
变化的速度让所有人惊讶。
the rapidity with which ...
后接从句，说明某动作或过程发生得有多快。
She was impressed by the rapidity with which he learned.
她对他学得之快印象深刻。
with rapidity
用作方式状语，强调速度之快。
Connections
Collocations
- the rapidity of change
- 变化之迅速
- The rapidity of change in technology can be overwhelming.技术变化之迅速可能令人不知所措。
- with great rapidity
- 以极快的速度
- The disease spread with great rapidity.这种疾病以极快的速度传播。
- the rapidity with which
- ……的速度之快
- The rapidity with which she learned English surprised everyone.她学英语速度之快让所有人惊讶。
- increasing rapidity
- 越来越快的速度
- The increasing rapidity of urban development raises environmental concerns.城市发展速度越来越快，引发了环境方面的担忧。
Synonyms
- speed
- 速度；速率 · 最常用词，泛指运动或进展的快慢，可直接表示速率；与 rapidity 相比更口语化，适用范围更宽。
Learner notes
Memory Tip
rapid 本就表示“快速的”，加上名词后缀 -ity 变成名词“迅速”。想象跑步冲刺时那种飞快的状态。
Context & Register
语域：formal 常见场景：学术写作、正式报告、文学描写 该词多用于较正式的书面语，如学术文章、正式报告或文学描写；日常口语中通常更常用 speed 或 quickness。
Pronunciation & Spelling
这些以 -idity 结尾的词（stupidity, humidity, timidity, validity, solidity）与 rapidity 同韵；拼写相近的 rapid 发音不同（/ˈræpɪd/），不押韵。
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.