instantaneous
gb/ˌɪnstəntˈæniəs/ us/ˌɪnstəntˈæniəs/
C1
英语
义项
0 个义项
adjective
C1
property
1
happening immediately, without delay
happening right away
用法模式：
instantaneous [reply/response/decision/effect]
常见错误：
Do not confuse with instant (a noun/adjective meaning ‘very quick’); instantaneous is mainly an adjective and sounds more formal.
近义词
immediate (More common and less formal.)
|
instant (More informal; often used before nouns (e.g., instant answer).)
反义词
delayed (Happening later than expected or needed.)
|
gradual (Happening slowly over time rather than right away.)
搭配
instantaneous response
|instantaneous reply
|instantaneous feedback
|instantaneous decision
|instantaneous effect
|instantaneous results
|instantaneous communication
|instantaneous access
|instantaneous transmission
|instantaneous approval
主题
time
|communication
|daily_life
例句
- We got an instantaneous reply to our email.
- The new software provides instantaneous feedback as you type.
- There was an instantaneous silence after his comment.
学习者例句
- Her answer was instantaneous.
- The medicine had an instantaneous effect.
adjective
C1
property
2
lasting only a very short time
very fast; happening in a moment
用法模式：
instantaneous [change/movement/shift/transition]
常见错误：
Instantaneous does not mean ‘temporary’; it means ‘very fast’ or ‘at once’.
近义词
momentary (Emphasizes very short duration, not necessarily cause-and-effect immediacy.)
|
rapid (Can be fast but not necessarily ‘in an instant’.)
反义词
slow (Taking a long time.)
|
prolonged (Continuing for a long time.)
搭配
instantaneous change
|instantaneous movement
|instantaneous shift
|instantaneous transition
|instantaneous stop
|instantaneous acceleration
|instantaneous collapse
|instantaneous transformation
|instantaneous flash
|instantaneous burst
主题
time
|science
|daily_life
例句
- The power cut caused an instantaneous shutdown of the machines.
- His expression changed in an almost instantaneous way.
- The car came to an instantaneous stop.
学习者例句
- The change was instantaneous.
- The light was instantaneous.
adjective
technical
C2
property
3
at a specific moment in time
measured at one exact time
用法模式：
instantaneous [speed/velocity/rate/current]
常见错误：
In technical contexts, instantaneous does not mean ‘very fast’; it means ‘at that exact moment’.
近义词
point-in-time (Explains the idea; not a common single-word synonym.)
反义词
average (Calculated over a period of time rather than at a single moment.)
|
cumulative (Built up over time.)
搭配
instantaneous speed
|instantaneous velocity
|instantaneous rate
|instantaneous acceleration
|instantaneous frequency
|instantaneous power
|instantaneous current
|instantaneous value
|instantaneous measurement
|instantaneous reading
主题
science
|math
|technology
例句
- The graph shows the instantaneous rate of change at each point.
- Instantaneous power varies throughout the cycle.
- The sensor records instantaneous voltage and current.
学习者例句
- Instantaneous speed is the speed at one moment.
语法
词典原形
instantaneous
IPA
GB/ˌɪnstəntˈæniəs/
US/ˌɪnstəntˈæniəs/
音节与重音
in - stant - an - eous （4 个音节）
Stress on 3rd syllable (an)
词形变化
Adjective
- Base: instantaneous
词族
Core family
相关表达
instantaneous combustion
1/ˌɪnstəntˈæniəs kəmbˈʌst͡ʃən/
fixed phrase
technical
rapid burning that starts suddenly
sudden burning that starts quickly
例句
- The report discussed the risk of instantaneous combustion in dust-filled rooms.
- Some fine powders can ignite through friction and lead to instantaneous combustion.
instantaneous rate of change
1/ˌɪnstəntˈæniəs ɹˈeɪt əv t͡ʃˈeɪnd͡ʒ/
fixed phrase
technical
change at one exact moment
how fast something changes at one moment
例句
- The instantaneous rate of change is the slope of the tangent line to the curve.
- We computed the instantaneous rate of change at t = 2 seconds.
instantaneous velocity
1/ˌɪnstəntˈæniəs vəlˈɑsəti/
fixed phrase
technical
speed at an exact moment
the speed and direction at one moment
例句
- In calculus, you can find instantaneous velocity by taking the derivative of position.
- The instrument estimates instantaneous velocity from successive position readings.