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
is to be defined
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "is to be defined" is correct and usable in written English.
It can be used when indicating that a term or concept will be clarified or explained later in the text. Example: "The term 'sustainability' is to be defined in the following section to ensure a clear understanding."
✓ Grammatically correct
Science
News & Media
Encyclopedias
Alternative expressions(20)
will be defined
needs to be defined
is to be determined
should be defined
will be clarified
is yet to be defined
remains to be defined
is to be characterized
is to be ended
is to be redeveloped
is to be announced
is to be spread
is to be eliminated
is to be creative
is to be commended
is to be named
is to be seen
is to be forbidden
is to be cultivated
is to be released
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
54 human-written examples
He says: "To resist this new racism is to be defined as racist yourself, which is perverse.
News & Media
Mr. Bush called it a "new compact for global development" that is to be defined by "a new accountability" for both rich and poor nations.
News & Media
The nature of ritual, in other words, is to be defined in terms of its function in a society.
Encyclopedias
The belief in life after death, which is maintained by each of the Abrahamic religions, raises the metaphysical question of how the human person is to be defined.
Encyclopedias
But the debate here goes much deeper, to the question of what government is for and how community is to be defined.
News & Media
The message is that "legitimate" Egyptian identity is to be defined from the top down: what one looks like, who one sleeps with, and what god one prays to are markers of belonging, and everyone is vulnerable to exclusion.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
6 human-written examples
The deal allows Syrian government warplanes to continue to fly missions in some areas that are to be defined later.
News & Media
The constant chosen was Planck's constant, which was to be defined as equal to 6.6260693 × 10−34 joule second.
Encyclopedias
On the blackboard was a list of 10 "diversity definitions" -- words like "minority," "prejudice" and "culture shock" -- that were to be defined and discussed.
News & Media
Territoriality is a principle by which members of a community are to be defined.
Science
In addition to model design, related specifications are to be defined in the implementation.
Science
Expert writing Tips
Best practice
When using "is to be defined", ensure that the definition is provided clearly and concisely later in your text. Avoid ambiguity by explicitly linking the term to its subsequent definition.
Common error
Avoid using "is to be defined" without a clear plan to actually define the term later in the text. Leaving the term undefined can confuse readers and undermine your argument.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "is to be defined" functions as a linking verb introducing a subject complement that specifies a future action. It signals an intention to provide a definition or clarification later in the text. Ludwig AI shows many instances where it prefaces formal explanations in various fields.
Frequent in
Science
33%
News & Media
24%
Encyclopedias
17%
Less common in
Formal & Business
4%
Wiki
2%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "is to be defined" is a common and grammatically correct way to introduce a definition or clarification that will be provided later in the text. According to Ludwig AI, the phrase is widely used across different contexts such as science, news, and encyclopedias. It is best practice to ensure that the definition is indeed provided and clearly linked to the initial statement. While the phrase is generally neutral to formal, avoiding vague references will improve writing clarity. Related phrases include "will be defined" and "needs to be defined".
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
will be defined
Changes the tense to future simple, emphasizing the future action of defining. It's a more direct statement about future definition.
must be defined
Adds a sense of obligation or necessity to the act of defining. It implies that defining something is crucial or required.
should be defined
Introduces a recommendation or suggestion that something be defined, implying it is a good idea or best practice.
needs to be defined
Highlights the necessity of defining something, suggesting that it is currently lacking a clear definition.
is to be determined
Shifts the focus from defining to determining, implying that the outcome is yet unknown and requires a process of discovery.
is to be specified
Emphasizes the detailed and precise nature of the clarification that will follow, focusing on exact details.
will be clarified
Replaces "defined" with "clarified", emphasizing the act of making something clearer and easier to understand.
is yet to be defined
Highlights the unfinished nature of the definition, stressing that it remains incomplete or outstanding.
remains to be defined
Similar to "is yet to be defined", but with a slightly more formal tone, emphasizing the continuing need for a definition.
is to be characterized
Emphasizes the act of describing the qualities or peculiarities of something, moving beyond a simple definition.
FAQs
How can I use "is to be defined" in a sentence?
You can use "is to be defined" to indicate that you will provide a definition for a term or concept later in your text. For example, "The scope of this project "is to be defined" in the following section".
What are some alternatives to "is to be defined"?
Some alternatives include "will be defined", "must be defined", or "needs to be defined", depending on the specific nuance you want to convey.
Which is correct, "is to be defined" or "is defined"?
"Is defined" indicates that something already has a definition. "Is to be defined" indicates that the definition will be provided later. The correct choice depends on whether the definition is already known or will be introduced.
What's the difference between "is to be defined" and "is to be determined"?
"Is to be defined" implies a formal explanation of meaning, while "is to be determined" suggests a process of finding something out or establishing it, indicating that the exact nature of something "is to be determined" through investigation or analysis.
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