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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
or once
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "or once" is correct and usable in written English.
It can be used to indicate an alternative option or a single occurrence in a context where choices or instances are being discussed. Example: "You can choose to visit the museum twice a year, or once if you prefer a more casual approach."
✓ Grammatically correct
News & Media
Academia
Science
Wiki
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
Bar Muslim immigrants (or, once refined, those from terror-linked countries).
News & Media
Do this at 120 BPM (or, once again, at 60 BPM), one note per beat.
Wiki
Dorcas: Or once very common, yes.
Academia
Or once a month new clothes.
Tito: Once now or once before?
News & Media
Floodplain soils may flood yearly or once every several years.
Protocol is behavior that comes naturally, or once did.
News & Media
A model the country was, or once seemed to be.
News & Media
Or once he'd taken the oath of office.
News & Media
Or once you're performing, are all sites essentially the same?
News & Media
Or, once again, the Donald Duck in him will miscalculate.
News & Media
Expert writing Tips
Best practice
When using "or once", ensure the context clearly presents two distinct options or scenarios, one of which involves a single occurrence of something.
Common error
Avoid using "or once" when there isn't a clear alternative or when the sentence doesn't logically present two options. For example, don't say "I went to the store, or once," unless there's a contrasting alternative visit or activity being implied.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "or once" functions as a conjunction phrase, connecting two alternatives where one option is a single occurrence of an event or action. It is used to present a choice, offering a single instance as a possible alternative to another action or frequency, according to Ludwig.
Frequent in
News & Media
30%
Science
25%
Academia
20%
Less common in
Wiki
15%
Formal & Business
5%
Reference
5%
Ludwig's WRAP-UP
In summary, the phrase "or once" serves as a conjunction to present alternative options, one of which involves a single instance of an action or event. According to Ludwig, it is grammatically correct and widely applicable, as evidenced by its presence across diverse sources like news, academia, science, and general web content. When writing, ensure that "or once" logically connects two distinct choices, with one being a single occurrence. This guidance should help writers effectively integrate "or once" into their writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
or one time
Directly substitutes "once" with "one time", maintaining the meaning but altering the phrasing.
or on one occasion
Replaces "once" with a more formal expression, suitable for academic or professional contexts.
or a single time
Emphasizes the singularity of the event or instance.
or just once
Adds emphasis on the simplicity of a single occurrence.
or on one instance
Similar to "on one occasion" but slightly less formal.
or in one instance
Specifies a particular instance among many.
or alternatively, once
Introduces a choice with "alternatively", then specifies "once" as the alternative.
or at least once
Indicates a minimum frequency or occurrence.
or possibly once
Suggests the occurrence is uncertain but possible.
or maybe once
Similar to 'possibly once', indicating uncertainty about the occurrence.
FAQs
How can I use "or once" in a sentence?
Use "or once" to present a choice where one option is a single instance of something. For example, "You can visit the museum twice a year, "or once" if you prefer a more casual approach."
What are some alternatives to "or once"?
Alternatives include "or one time", "or on one occasion", or "or a single time", depending on the level of formality you need.
Is there a difference between "or once" and "or just once"?
"Or just once" adds emphasis on the simplicity of a single occurrence. "You can call me every week, "or just once" if you're busy" implies that calling more than once is acceptable, but a single call is also sufficient.
When is it incorrect to use "or once"?
It's incorrect if the sentence doesn't present a clear choice or alternative. Avoid using it if there's no logical comparison to another option or frequency.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested