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
by common definition
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "by common definition" is correct and usable in written English.
It can be used when referring to a widely accepted or standard meaning of a term or concept. Example: "By common definition, a 'mammal' is an animal that is warm-blooded and has hair or fur."
✓ Grammatically correct
News & Media
Science
Encyclopedias
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
2 human-written examples
Khadr was, by common definition, a child soldier.
News & Media
By common definition, the new Samsung Crest Solar is about as far from a smartphone as you can get – but if you're going somewhere where electric outlets are scarce, it's probably a smart idea to carry one.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
The targets are underpinned by common definitions to ensure a unified approach.
News & Media
That meant that tech companies, by one common definition, occupied the four top spots in the market capitalization rankings, a rare and brief occurrence.
News & Media
No Group of 7 economy has yet been shown to be in recession, at least by the common definition of two consecutive quarters of contraction.
News & Media
The report does not draw the legal conclusion that the CIA's actions constituted torture, though it makes clear that in some cases they amounted to torture by a common definition, two people who have read the report said.
News & Media
By one common definition, when health differences are preventable and unnecessary, allowing them to persist is unjust (13).
Science
Research can be aligned by using a common definition, thereby avoiding misinterpretations.
Science
The 1999 APS classification criteria made epidemiologic studies practical by providing a common definition for this disease.
The lack of consensus could in turn possibly be explained by the lack of a common definition of ownership and by the deteriorated personal relationships between some partners.
In my view, it's the reverse: By stripping away any common definition of the proper relationship between sex and marriage, and asking every couple to essentially rebuild the institution from the ground up, he would end up piling far more weight on the marital unit than any individual relationship can be reasonably expected to bear.
News & Media
Expert writing Tips
Best practice
Use "by common definition" to ensure clarity and avoid ambiguity when introducing a term or concept, especially when discussing complex topics or subjects with varied interpretations. For example, "By common definition, a recession is characterized by two consecutive quarters of economic decline."
Common error
Avoid assuming that everyone shares the same "common definition". Even if a definition seems obvious, briefly clarifying it can prevent misunderstandings, especially when writing for a diverse audience. If the definition is contested, acknowledge this instead of presenting it as the only correct one.
Source & Trust
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "by common definition" functions as a qualifier, specifying that the subsequent term or concept is being presented according to its widely accepted or standard meaning. Ludwig AI confirms its acceptability and utility in written English.
Frequent in
News & Media
35%
Science
33%
Encyclopedias
10%
Less common in
Formal & Business
7%
Social Media
5%
Reference
5%
Ludwig's WRAP-UP
In summary, the phrase "by common definition" is a grammatically sound and frequently employed phrase to introduce a widely accepted understanding of a term. As Ludwig AI indicates, it is appropriate for use in written English. Its primary function is to ensure clarity and prevent ambiguity, particularly in contexts where the term might be subject to varying interpretations. While suitable across various registers, it is particularly common in news, scientific, and encyclopedic texts, reflecting its neutrality. Remember to avoid the assumption of universally shared knowledge by briefly clarifying the concept. Consider using alternative phrases like "according to general understanding" or "as generally understood" for variety.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
by standard definition
This emphasizes the adherence to a formal or official definition.
according to general understanding
This alternative emphasizes the widespread acceptance of the definition.
as generally understood
This phrase highlights the common interpretation of a concept.
in the conventional sense
This option stresses adherence to established or traditional meanings.
by popular understanding
This alternative emphasizes the public's perception of a term.
as commonly known
This highlights the widespread knowledge of a definition.
in layman's terms
This suggests simplifying a definition for a non-expert audience.
as a rule
This suggests the definition is usually accepted.
generally speaking
This emphasizes that a definition holds true in most cases.
for all intents and purposes
This phrase focuses on the practical application of a definition.
FAQs
How can I use "by common definition" in a sentence?
Use "by common definition" to introduce a widely accepted meaning of a term or concept. For example, "By common definition, a planet is a celestial body that orbits a star."
What's a synonym for "by common definition"?
Synonyms include "according to general understanding", "as generally understood", or "by standard definition".
Is it always safe to assume a "common definition" is universally known?
No, it's not always safe. Even if a definition seems obvious, briefly clarify it to avoid misunderstandings. If there are competing definitions, acknowledge them.
When is it best to use "by common definition"?
It's best to use "by common definition" when you want to establish a shared understanding of a term or concept, especially in contexts where the term might have multiple interpretations or be subject to debate.
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
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested