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
in reason
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "in reason" is correct and usable in written English.
It is typically used to indicate that something is within the bounds of rationality or logic. Example: "Her demands were reasonable, and I agreed to them in reason."
✓ Grammatically correct
News & Media
Science
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
58 human-written examples
By the experiment test and analysis, the reasoning effects of the extended production rule are more in reason.
Science
No more believing in reason and compromise.
News & Media
Breyer: Faith in reason, or faith in force?
04.16.2009 - Breyer: Faith in reason, or faith in force?
"His passion lay in reason," the son writes.
News & Media
Belief in reason pulled him one way, irrational passion another.
News & Media
This potentiality is generally undervalued, in reason of the spectra complexity.
Science
The law still has degrees of harshness, and courts and legislatures must act in reason.
Academia
In Reason and value: Themes from the moral philosophy of Joseph Raz, ed.
Academia
Human-verified similar examples from authoritative sources
Similar Expressions
2 human-written examples
Because professional athletes change teams constantly, game makers have a built-in reason to produce updated versions every year.
News & Media
They have a built-in reason to support the show.
Wiki
Expert writing Tips
Best practice
When using "in reason", ensure the context clearly establishes a logical or justifiable connection between the elements being related. For example, "The court acted in reason when it considered all available evidence."
Common error
Avoid using "in reason" in highly informal or colloquial contexts, as it may sound overly formal or stilted. Opt for simpler alternatives like "because" or "that's why" in casual conversations.
Source & Trust
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "in reason" functions primarily as a prepositional phrase that modifies a verb or clause, indicating the basis, justification, or rationale behind an action or statement. Ludwig AI confirms its grammatical correctness and usability. For example, "The law still has degrees of harshness, and courts and legislatures must act in reason."
Frequent in
News & Media
44%
Science
36%
Academia
18%
Less common in
Encyclopedias
1%
Wiki
1%
Formal & Business
0%
Ludwig's WRAP-UP
The phrase "in reason" is a grammatically sound prepositional phrase used to denote justification or rationale. As Ludwig AI confirms, it's most frequently encountered in news and media, scientific writing, and academic contexts, signaling a neutral to formal register. While alternatives like "with good reason" or "on rational grounds" exist, "in reason" offers a specific emphasis on logical basis. When using "in reason", ensure the context clearly establishes a logical connection; avoid it in informal settings where simpler alternatives are more appropriate. The frequency of the term in authoritative sources underscores its validity and utility in formal communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
with good reason
Emphasizes the existence of a valid justification or basis for an action or belief.
on rational grounds
Highlights that a decision or action is based on logical and sensible considerations.
for a valid reason
Focuses on the legitimacy and acceptability of the cause or explanation.
on the basis of reason
Stresses that logic and rationality are the primary foundation for a particular viewpoint or action.
by virtue of reason
Indicates that something is true or valid because of the principles of logical thought.
justifiably
Implies that an action or decision is defensible and reasonable.
with justification
Highlights that there is an acceptable explanation or defense for something.
logically
Adverb emphasizing that something proceeds according to sound reasoning.
rationally
Adverb indicating that something is done or considered in a sensible and logical way.
on reasonable grounds
Similar to 'on rational grounds', but emphasizes the fairness and moderation of the basis.
FAQs
How can I use "in reason" in a sentence?
Use "in reason" to show something is justifiable or logically sound, as in, "The committee's decision, "in reason", reflected careful deliberation".
What are some alternatives to "in reason"?
Alternatives include "with good reason", "on rational grounds", or "for a valid reason", depending on the specific nuance you want to convey.
Is it correct to say "within reason" instead of "in reason"?
While "in reason" is grammatically sound, "within reason" is more common when implying limitations or boundaries, such as "Requests will be granted within reason".
What's the difference between "in reason" and "because of"?
"In reason" suggests a logical justification or basis, whereas "because of" simply indicates cause and effect, without necessarily implying rationality. For example, "He succeeded in reason of hard work" versus "He succeeded because of hard work".
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