Used and loved by millions
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
as previously known
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "as previously known" is correct and usable in written English.
It can be used when referring to information or knowledge that has been established or recognized before the current context. Example: "The results of the experiment were consistent with the findings as previously known in the literature."
✓ Grammatically correct
Science
News & Media
Academia
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
19 human-written examples
Emerging viral pathogens include newly discovered viruses as well as previously known viruses that are either increasing, or threatening to increase in incidence.
Academia
These findings highlight novel as well as previously known genes encoding virulence traits and metabolic pathways important for S. aureus proliferation at sites of infection, which may represent new therapeutic targets.
Academia
The constitution of 1979 revived the local, district, and regional councils, but the military government in 1982 appointed its own regional secretaries and district secretaries to take charge of the regions and districts and abolished the local councils as previously known.
Encyclopedias
One of the new SNPs, named MG2, identifies a new sub-haplogroup downstream of Q-M3; the other three (MG11, MG13, MG15) are upstream of Q-M3 but downstream of M242, and describe branches at the same phylogenetic positions as previously known SNPs in the samples tested.
"Better known" has sometimes been interpreted simply as "previously known to the knower of the demonstration" (i.e., already known in advance of the demonstration).
Science
Today we talk about the subway bomb scare in New York City, the women calling on Congress to investigate their sexual misconduct allegations against President Trump, and a new analysis that found cops shoot Americans twice as often as previously known.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
41 human-written examples
Other Compton instruments have detected and charted more than 400 examples of steady emitters of gamma rays, 10 times as many as were previously known.
News & Media
For sufficiently large n (specified explicitly), these results are as strong as a previously known bound that is conditional on GRH.
Academia
Cecilia Apaldetti of the National University of San Juan in Argentina and her colleagues examined a new species, Ingentia prima, as well as a previously known species called Lessemsaurus sauropoides.
News & Media
The largest is located twice as far from Uranus as the previously known rings.
Wiki
In December, news leaked that former Microsoft exec Ray Ozzie had raised $4 million for a stealthy startup known as Talko, previously known as Cocomo.
News & Media
Expert writing Tips
Best practice
Use "as previously known" to smoothly integrate established facts or concepts into your writing, ensuring clarity and avoiding unnecessary repetition. It is particularly useful in academic and scientific contexts.
Common error
Avoid using "as previously known" in casual conversation or informal writing. Simpler alternatives like "as you know" or "as we've already discussed" are more appropriate.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "as previously known" functions as an adverbial phrase, modifying a statement by indicating that the information is not new, but rather something that has been established or recognized before. Ludwig AI confirms the correctness and usability of this phrase.
Frequent in
Science
50%
News & Media
22%
Academia
17%
Less common in
Encyclopedias
6%
Wiki
3%
Formal & Business
2%
Ludwig's WRAP-UP
In summary, "as previously known" is a grammatically correct and frequently used adverbial phrase to introduce established facts or concepts, as affirmed by Ludwig AI. It signals that the following information is not new and is part of existing knowledge. While prevalent in scientific and academic writing, its formality may not suit casual conversations. Alternatives like "as is already known" or "as previously reported" can offer similar meanings with slight contextual variations. Employing "as previously known" judiciously ensures clarity while avoiding redundancy, particularly in formal contexts.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
as was already known
Emphasizes that the information was known at an earlier time.
as is already known
Highlights the current state of knowledge about the topic.
as has been previously established
Focuses on the fact that something has been confirmed or proven.
as is previously established
Highlights the existing state of something already set up.
as has been previously documented
Emphasizes that the information is written down or recorded.
as previously reported
Indicates that the information was shared or communicated before.
as previously shown
Highlights that something was made visible or demonstrated before.
as previously indicated
Implies that there was a prior suggestion or hint of the information.
as has been previously demonstrated
Focuses on a past showcasing or explanation.
as earlier research suggests
Refers to prior academic investigation indicating something to be true.
FAQs
How can I use "as previously known" in a sentence?
You can use "as previously known" to refer to information that has already been established or recognized. For instance, "The effects of climate change, as previously known, are becoming more pronounced."
What phrases can I use instead of "as previously known"?
Alternatives include "as was already known", "as is already known", or "as previously reported", depending on the specific context.
Is there a difference between "as previously known" and "as is known"?
"As is known" generally refers to something that is currently widely recognized, while "as previously known" emphasizes that the information was established at an earlier time. The choice depends on whether you want to highlight the historical aspect or the current acceptance of the information.
When is it appropriate to use "as previously known" in writing?
It's appropriate in formal writing, especially in academic papers, reports, or articles, where you need to refer to established facts or theories. Avoid using it in casual or informal contexts where it might sound overly formal.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested