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 defined on
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "as defined on" is correct and usable in written English.
It is typically used to refer to a specific definition or explanation provided in a document, website, or other source. Example: "The term 'data privacy' is as defined on the official website of the organization."
✓ Grammatically correct
Science
News & Media
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
49 human-written examples
The hypergeometric probability test was used to calculate the probability of finding at least the observed number of metabolites of a given pre-defined metabolic pathway (as defined on the KEGG pathway database) in the clusters identified through the GSVD algorithm, with knowledge of the total number of metabolites present in that pathway detected by LC-MS in these samples.
Science
ABSOLUT New York, as defined on a new billboard at Lafayette and Bond Streets, is a studio apartment in the shape of a vodka bottle.
News & Media
Created in 2000, the foundation has a mission, as defined on the museum's Web site, "to preserve and make available a comprehensive collection of materials relating to the history, evolution and cultural significance of human sexuality".
News & Media
In a letter to the state, Mr. Hollister said that income restrictions on Clock Hill buyers, as defined on the deeds, seemed too high for the development to be counted toward a moratorium.
News & Media
Three centuries ago, said James R. Akerman of the Newberry Library in Chicago, "political boundaries were not as defined on maps in many instances, as they are now, and were often more fluid in practice, so cartographers did not give them the same level of attention that they do now".
News & Media
Similarly, visceral adipose tissue as defined on CT has been shown to be associated with adverse cardiovascular risk factors [25].
Science
Human-verified similar examples from authoritative sources
Similar Expressions
10 human-written examples
For, let the function be defined on as follows: (2.11).
Set, and define on as follows: (4.3).
What do deducibility and validity, as sharply defined on the addendum, tell us about correct deductive reasoning in general?
Science
where F and V are as defined earlier on Equations 2 and 3, respectively.
Science
First attempt success was defined as successful tracheal intubation, as defined above, on the initial attempt.
Science
Expert writing Tips
Best practice
When using "as defined on", ensure the source you are referencing is authoritative and easily accessible to your audience. Providing a direct link or citation is helpful.
Common error
Avoid using "as defined on" without specifying a clear source. Saying "as defined on the internet" is too vague and reduces credibility.
Source & Trust
80%
Authority and reliability
4.4/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "as defined on" functions as a prepositional phrase that introduces the source of a definition. This clarifies where the reader can find the specific meaning of a term or concept. Ludwig examples confirm this usage pattern.
Frequent in
Science
65%
News & Media
25%
Wiki
5%
Less common in
Formal & Business
5%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "as defined on" is a prepositional phrase used to specify the source of a definition, commonly found in scientific, news, and media contexts. As Ludwig confirms, it helps ensure clarity and adds credibility by explicitly referencing where the definition comes from. Though grammatically sound, its use is relatively uncommon. For stronger writing, ensure you are referencing authoritative and easily accessible sources, and avoid vague references. Alternatives like "as specified in" or "according to" can provide similar clarity, and Ludwig provides examples of these usages too.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
as specified in
Emphasizes a more formal or regulatory context where the definition is officially documented.
as stated in
Highlights that the definition is explicitly mentioned in the referenced source.
according to
Indicates that the information or definition comes from the named source.
based on the definition in
Focuses on the derivation of understanding from the source's provided definition.
defined in
A more concise way of indicating where the definition can be found.
as per
A short and formal way to say "according to".
as detailed on
Highlights that the source provides a comprehensive explanation.
outlined in
Suggests that the source presents a structured overview of the definition.
elucidated on
Emphasizes that the definition is made clear and understandable in the source.
explained on
Indicates a clear explanation of the definition is available in the source.
FAQs
How can I use "as defined on" in a sentence?
Use "as defined on" to refer to a specific definition or explanation found in a particular source. For example, "Conversion Rate Optimization (CRO), as defined on Wikipedia, is the method of creating an experience..."
What are some alternatives to using "as defined on"?
You can use alternatives such as "as specified in", "as stated in", or "according to" depending on the context and the level of formality required.
Is it better to use "as defined on" or "as defined in"?
Both "as defined on" and "as defined in" are correct, but "as defined on" is generally used when referring to a website or online resource, while "as defined in" is used for documents, books, or articles.
When should I avoid using "as defined on"?
Avoid using "as defined on" when the source is not credible or easily verifiable. In such cases, it's better to provide a more authoritative or widely accepted definition.
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
80%
Authority and reliability
4.4/5
Expert rating
Real-world application tested