at which time

USAGE SUMMARY

The phrase 'at which time' is correct and usable in written English.
You use it when referring to a point or moment in time, usually in relation to something else that happened or will happen. For example: "The rules will come into effect at which time all employees will be required to follow them."

✓ Grammatically correct

Science

News & Media

Academia

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

In 2010, Caballero moved to UC San Diego, at which time Lucien Carroll joined the project.

University of California, Berkeley

At which time you will be prompted again to either install or postpone.

Cornell University

Of the 13 traps, six exceeded the 100-moth threshold at which time scouting is recommended.

Cornell University

The questions asked are: How often and at which time points should drug effects be measured?

Neuroscience & Biobehavioral Reviews

Male pups were weaned on post-natal day 23 ± 1, at which time treatments were initiated.

Nature

The deal was finalized in 2017, at which time Mayer resigned from Yahoo!

Britannica

"We will revisit the question in September, at which time there will be more information available".

The New York Times

Judges serve in office until age 75, at which time they are required to retire.

Encyclopedia Britannica

He remained in that job until 1924, at which time he was fired.

The New Yorker

Mutoscope and Biograph were on the decline by 1920, at which time Rabkin bought them out.

The New Yorker

At which time they will double.

Forbes

Expert writing Tips

Best practice

When using "at which time", ensure that the clause following it directly relates to the preceding statement, creating a seamless flow of information.

Common error

Avoid overuse of "at which time" in informal writing. Simpler alternatives like "when" or "as soon as" can improve readability and make your writing more accessible.

Linguistic Context

The phrase "at which time" functions as a prepositional phrase that introduces an adverbial clause of time. It modifies the main clause by specifying when an action or event takes place, linking it to a prior event. Ludwig shows many examples from academic and news sources.

Expression frequency: Very common

Frequent in

Science

39%

News & Media

26%

Academia

13%

Less common in

Wiki

9%

Encyclopedias

5%

Formal & Business

2%

Ludwig's WRAP-UP

In summary, "at which time" is a grammatically sound phrase used to denote a specific point when something occurs, as verified by Ludwig AI. It is most frequently encountered in formal contexts like scientific and academic writing, and news media. While useful for establishing chronological order, remember that alternatives like "when" or "as soon as" might be more appropriate in informal settings. Ludwig's examples provide a clear picture of its diverse applications, demonstrating its value in creating a seamless flow of information.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

when

A direct and simple substitute, suitable for less formal contexts.

upon which

A more formal and slightly archaic alternative, emphasizing the dependency of the subsequent event.

at that point

Highlights a specific juncture or stage in a process or sequence.

at that moment

Emphasizes the immediacy or suddenness of the event that follows.

thereupon

A formal and somewhat old-fashioned term indicating what immediately followed.

whereupon

Indicates an immediate consequence or result of a preceding action or event.

as soon as

Implies a lack of delay between the initial event and the subsequent occurrence.

immediately after

Stresses the direct temporal succession of events.

subsequently

Indicates that the second event happened after the first, but without necessarily implying a direct causal link.

following which

A more descriptive phrase that clearly indicates the order of events.

FAQs

How can I use "at which time" in a sentence?

Use "at which time" to connect two related events in a sentence, clearly indicating when the second event occurs in relation to the first. For example, "The meeting will adjourn at 5 PM, "at which time" all members should submit their reports."

What are some alternatives to "at which time"?

You can use alternatives like "when", "at that point", or "immediately after" depending on the context and desired level of formality.

Is "at which time" formal or informal?

"At which time" is generally considered a more formal phrase. In less formal contexts, using "when" or "as soon as" might be more appropriate.

What's the difference between "at which time" and "at that time"?

"At which time" directly connects two events in a sequence, while "at that time" refers back to a previously mentioned time. For example: "The deal will be signed, at which time the company will be sold" versus "The deal will be signed. At that time, the company's stock will likely rise".