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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
valid in perpetuity
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "valid in perpetuity" is correct and usable in written English.
It can be used in legal or formal contexts to indicate that something is valid indefinitely or for an unlimited duration. Example: "The contract is valid in perpetuity, ensuring that the terms remain in effect forever."
✓ Grammatically correct
Science
Wiki
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
Amendments generally require a two-thirds majority of both chambers of parliament; the fundamental principles of the constitution, as expressed in the articles guaranteeing human dignity, the separation of powers, the federal structure, and the rule of law are valid in perpetuity.
Wiki
The CKD-EPI and MDRD equations will be studied because they are anchored to both creatinine and cystatin C reference methodology and therefore likely to generate data that will be valid in perpetuity.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
55 human-written examples
He formally advised city officials to deny Madison Square Garden's request to stay put "in perpetuity".
News & Media
It is backed by the Scott Trust, which is designed to ensure it survives "in perpetuity".
News & Media
The U.S. gained the rights to the canal strip "in perpetuity".
Wiki
Valuations cannot rise in perpetuity.
News & Media
Should the authority exist in perpetuity?
News & Media
These royalties will be paid in perpetuity.
News & Media
Those shadows are there in perpetuity".
News & Media
The fees are guaranteed in perpetuity.
News & Media
"Eternity in perpetuity," she says.
News & Media
Expert writing Tips
Best practice
Use "valid in perpetuity" in formal and legal contexts where you want to emphasize the enduring and unlimited nature of validity. For example, when describing a contract or agreement.
Common error
Avoid using "valid in perpetuity" in casual conversation or informal writing. The phrase is highly formal and can sound pretentious or overly verbose in everyday contexts.
Source & Trust
90%
Authority and reliability
4.2/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "valid in perpetuity" functions as an adjectival modifier describing the enduring nature of something's validity. As noted by Ludwig, this phrase suggests that the validity is intended to last indefinitely. It commonly appears in formal contexts, such as legal documents or constitutional principles.
Frequent in
Science
50%
Wiki
50%
News & Media
0%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "valid in perpetuity" is used to describe something that is permanently valid, without any end date. According to Ludwig, it's grammatically correct but relatively rare. Ludwig's analysis of the example sentences indicates its primary contexts of use are science and wiki articles. Because of its formal tone and use cases, it's best suited for legal, academic, and formal writing. When writing, remember that simpler alternatives exist for more casual contexts. Examples of these are "valid forever" or "valid indefinitely".
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
permanently valid
Replaces the prepositional phrase with a single adverb while retaining the core meaning.
valid indefinitely
Substitutes "in perpetuity" with an adverb indicating a lack of a defined end.
valid forever
Uses a simpler, more common term for infinite duration.
valid without end
Replaces "in perpetuity" with a phrase that directly implies the absence of termination.
valid for all time
Emphasizes the enduring nature of the validity.
valid eternally
Utilizes an adverb to convey the everlasting nature of validity.
valid in all ages
Highlights the continuous validity across different time periods.
permanently effective
Shifts focus slightly to the ongoing effect or force of the validity.
continuously valid
Uses an adverb to highlight the uninterrupted nature of the validity.
unconditionally valid
Indicates that the validity is not subject to any limitations or conditions.
FAQs
How can I use "valid in perpetuity" in a sentence?
You can use "valid in perpetuity" to describe agreements, contracts, or principles that are intended to remain in effect indefinitely. For example, "The fundamental principles of the constitution, as expressed in the articles guaranteeing human dignity, are "valid in perpetuity"".
What does "valid in perpetuity" mean?
"Valid in perpetuity" means valid forever, without any specified end or expiration. It signifies that something remains legally sound or effective for an unlimited duration.
Are there simpler alternatives to "valid in perpetuity"?
Yes, you can use alternatives like "valid forever" or "valid indefinitely" for a less formal tone.
Is it appropriate to use "valid in perpetuity" in everyday conversation?
While grammatically correct, "valid in perpetuity" is more suited for formal and legal contexts. In everyday conversation, simpler phrases like "valid forever" or "always valid" are generally more appropriate.
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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
90%
Authority and reliability
4.2/5
Expert rating
Real-world application tested