instantaneous
/,instən'teinjəs/
Definition
- Adjective:
- Happening or done immediately, without any delay: Describes something that occurs at the exact moment it is needed, perceived, or initiated.
- Existing or measured at a particular instant: In physics, describes a quantity (like velocity) at a specific point in time.
Usage
- The adjective "instantaneous" is used to describe an event, reaction, or effect that is so fast there is no perceptible lapse in time.
- It is often used in scientific, technical, and formal contexts, but can also be used in general language for emphasis.
- It typically precedes a noun (e.g., ) or follows a linking verb (e.g., ).
Examples
- Adjective:
- The flash of lightning was followed by an instantaneous clap of thunder.
- Modern messaging allows for instantaneous communication across the globe.
- The system provides instantaneous feedback to the user.
- Death was instantaneous in the accident.
Advanced Usage
- "Instantaneous velocity": In physics, the velocity of an object at a specific moment in time, as opposed to its average velocity over a period.
- The car's speedometer shows its instantaneous speed.
- "Instantaneous rate of change": In calculus, the derivative of a function at a specific point.
- We calculated the instantaneous rate of change in the population.
Variants and Related Words
- Instantaneously (adverb): In an instantaneous manner; immediately.
- The news spread instantaneously online.
- Instantaneity (noun, rare): The quality of being instantaneous.
- Instant (adjective): While often used synonymously in casual speech, "instant" can imply a very short, but not necessarily zero, delay (e.g., instant coffee), whereas "instantaneous" emphasizes the absence of any measurable delay.
Synonyms
- Immediate: Happening or done without delay.
- Instant: Occurring or done at once.
- Direct: Without any intervening factor or delay.
- Prompt: Done without delay; immediate.
Antonyms
- Delayed: Happening at a later time than planned or expected.
- Gradual: Taking place or progressing slowly over time.
- Protracted: Lasting for a long time or longer than expected.
Related Phrases and Idioms
- (In) the blink of an eye: An idiom meaning "instantaneously" or "extremely quickly."
- The magician made the coin vanish in the blink of an eye.
- At the speed of light: Used figuratively to mean "instantaneously."
- Rumors travel at the speed of light in this office.
Adjective
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occurring with no delay
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relief was instantaneous
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instant gratification
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