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
under the notion
Grammar usage guide and real-world examplesUSAGE SUMMARY
"under the notion" is correct and usable in written English.
You can use it when referring to the idea or understanding of something. For example, "The public works under the notion that taxes will be used to fund more public services."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(20)
assuming that
believing that
on the assumption that
thinking that
based on the understanding
premised on the idea
with the understanding that
in the belief that
taking for granted that
presuming that
is equivalent to
in the wishes of
rapidly thereafter
for the immediate future
Very soon
somewhere later
one week before
at the early time
in the next weeks
during the previous years
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
51 human-written examples
I think I was operating under the notion that I could rectify the situation.
News & Media
Pool told me that he started shooting heroin after dropping out of college, operating under the notion — as she put it — that "writers needed conflict and adversity.
News & Media
Working under the notion that the best antipoverty strategy is a job, the commission also recommended expanding programs aimed at preparing students for college and giving high school students and adults work experience and job training.
News & Media
"We couldn't quickly put that list together, but we could make sure that the F.B.I. did not act under the notion that he had no contacts," the source said.
News & Media
In a nothing-to-see-here contrast, Democrats are coordinating far more loosely, according to several media operatives on Capitol Hill, under the notion that they expect the law to be upheld.
News & Media
Washington duly wrote to Clinton, who acknowledged that the hanging was a "barbarous outrage", but argued that "to sacrifice innocence under the notion of preventing guilt…would be adopting barbarity, and raising it to the greatest height".
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
9 human-written examples
Today, living in U.S.A., my adopted country, while my personal world is in unison, I am even more convinced of the need for interfaith understanding, as the external world seems to be tearing apart under the notions of religious strife and senseless violence.
News & Media
Reservoir computing fundamental principles have been contextually introduced under the notions of liquid state machines (LSM; Maass et al. 2002) and echo state networks (ESN; Jaeger 2002).
Science
But while he compared it to a policy brought in under Margaret Thatcher, the notion of mutualising the public sector has its roots in Labour tradition.
News & Media
UNDER AGE 8 -- The notion of doing good for others appeals to young children, especially when another child is involved.
News & Media
He is a holdover from the Patriots' 1996 Super Bowl run under Parcells, but the notion that he is now among the league's elite makes him squirm.
News & Media
Expert writing Tips
Best practice
Use "under the notion" to clearly state the underlying belief or assumption that guides an action or decision.
Common error
Avoid using "under the notion" in very casual conversation; simpler phrases like "thinking" or "believing" might be more appropriate.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "under the notion" functions as a prepositional phrase introducing a clause that expresses a reason, justification, or underlying belief for an action or decision. Ludwig's examples confirm its use to indicate the basis for an action or thought.
Frequent in
News & Media
47%
Science
42%
Wiki
7%
Less common in
Formal & Business
3%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "under the notion" is a grammatically sound and widely used prepositional phrase, functioning to introduce a belief or assumption underlying an action or statement. According to Ludwig, it's often found in news and media, scientific writing, and general discourse where explaining the basis for decisions or perspectives is important. While correct, it leans towards a neutral to formal register, so simpler alternatives might be better for casual contexts.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
based on the understanding
Replaces "notion" with "understanding", focusing on comprehension as the foundation.
premised on the idea
Substitutes "notion" with "idea", emphasizing the conceptual basis.
assuming that
Simplifies the phrase to a direct assumption.
with the understanding that
Adds "with", highlighting the possession of the understanding.
on the assumption that
Replaces "notion" with "assumption", emphasizing the act of presuming.
believing that
Focuses on the act of believing as the basis.
in the belief that
Highlights the belief as the context for action.
taking for granted that
Implies an acceptance without questioning.
presuming that
Focuses on the act of presuming as the starting point.
operating on the principle
Emphasizes a guiding principle rather than a simple belief.
FAQs
How can I use "under the notion" in a sentence?
"Under the notion" introduces an assumption or belief. For example, "They proceeded "under the notion" that more funding would solve the problem."
What's a simpler way to express "under the notion"?
Alternatives include "assuming that", "believing that", or "on the assumption that" depending on the level of formality you want to convey.
Is it always correct to use "under the notion"?
While grammatically correct, "under the notion" can sound formal. In casual conversations, simpler alternatives like "thinking that" might be better.
What's the difference between "under the assumption" and "under the notion"?
While similar, "under the assumption" emphasizes a presumption, while "under the notion" highlights a general belief or idea. "Under the assumption" implies less certainty than stating something "under the notion".
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested