exactly once

USAGE SUMMARY

The phrase "exactly once" is correct and usable in written English.
It is typically used in contexts where precision is important, indicating that something should occur one time without exception. Example: "The function should be called exactly once during the execution of the program."

✓ Grammatically correct

Science

News & Media

Academia

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Christina has seen the film exactly once.

The New Yorker

Or being funny exactly once?

The Guardian - TV & Radio

Each variable should be declared exactly once.

Stanford University

"That happened exactly once," he protested.

The New York Times

Each word in each clue will be used exactly once.

Massachusetts Institute of Technology

During all of that, he has lost exactly once.

The New York Times - Sports

Each last name will be used exactly once.

The New York Times

If each pair of distinct treatments appears exactly once as neighbors, neighbor designs are called minimal.

Journal of Statistical Planning and Inference

A graph is hamiltonian if it contains a cycle which goes through all vertices exactly once.

Information Processing Letters

We assume that each job can be processed exactly once without preemption.

Omega

He was selected an All-Star exactly once.

The New York Times - Magazine

Expert writing Tips

Best practice

When using "exactly once", ensure the context clearly defines the scope of the action or event. For example, specify the timeframe or system within which the single occurrence is relevant.

Common error

Avoid using "exactly once" when the intended meaning is simply 'once' without a strict enforcement of singularity. The addition of 'exactly' implies a controlled environment where multiple occurrences are actively prevented.

Linguistic Context

The phrase "exactly once" functions as an adverbial modifier, specifying the frequency or number of times an action or event occurs. As Ludwig AI confirms, this phrase is grammatically correct. Its primary function is to provide emphasis on the singularity of the occurrence.

Expression frequency: Very common

Frequent in

Science

42%

News & Media

29%

Academia

23%

Less common in

Formal & Business

6%

Encyclopedias

0%

Wiki

0%

Ludwig's WRAP-UP

The phrase "exactly once" is a grammatically sound and frequently used adverbial modifier that specifies a singular occurrence. Ludwig AI confirms its correctness and usability. Its primary function is to emphasize that something happens one time, and no more. It is suitable for use across various registers, from formal scientific writing to news reporting, especially when precision is crucial. While similar phrases exist, such as "precisely one time", "exactly once" strikes a balance between formality and clarity. When employing this phrase, ensure the scope of the action is well-defined to avoid ambiguity.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

once and only once

Highlights the uniqueness and limitation to a single instance, using a more emphatic structure.

precisely one time

More formal and emphasizes numerical precision.

only one time

Simple and direct alternative emphasizing exclusivity.

one time only

Places emphasis on the exclusivity and the temporal aspect of the single occurence.

one single time

Adds emphasis to the singularity of the occurrence.

a solitary instance

More formal and highlights the isolated nature of the event.

just once

More casual and indicates a minimal frequency.

in one instance

Focuses on the occurrence as a specific example.

on one occasion

Implies a particular event or circumstance.

a unique occurrence

Emphasizes the rarity and distinctiveness of the event.

FAQs

How can I use "exactly once" in a sentence?

Use "exactly once" to emphasize that something happens a single time and no more, like "Each user can claim the discount "exactly once"."

What's a more formal way to say "exactly once"?

A more formal alternative is "precisely one time". It adds a level of numerical precision and is suitable for technical or legal contexts.

Is it redundant to say "exactly once"?

While "once" already implies a single occurrence, "exactly once" emphasizes the uniqueness and exclusivity, making it suitable when this aspect is crucial.

When should I use "exactly once" instead of just "once"?

Use "exactly once" when it's important to stress that something should happen only one time and that multiple occurrences are not allowed or expected. For example, "Each element must be initialized "exactly once" before use."