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
The effectivity
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "The effectivity" is not commonly used in written English; the more standard term is "effectiveness." You can use "effectivity" in contexts discussing the capacity of something to produce a desired effect, though it may sound awkward to some readers.
Example: "The effectivity of the new policy will be evaluated after six months of implementation."
Science
News & Media
Academia
Alternative expressions(1)
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
60 human-written examples
The effectivity of this new design is confirmed from the results.
Science
The effectivity of surfactants for the removal of n-hexadecane or anthracene was SDS > Tween 80 > Triton X100.
Science
The effectivity of learning by playing serious games is increasingly subject to research, but information about how these games should actually be used in classes is limited.
Science
The effectivity of the SMA restrainer bars in arch dams was assessed through comparing with a traditional measure of reinforced steel across contraction joints.
The effectivity of the practitioners of this disruptive change in this region will not happen overnight.
News & Media
The effectivity of these therapies is limited and the development of alternative approaches is necessary.
Science
The effectivity of this combinatory treatment can not yet fully be explained.
Science
The effectivity of neoadjuvant therapy of rectal cancer is usually measured by the rate of pathologically confirmed complete responses (pCR).
Science
The effectivity of one signaling molecule is largely dependent on the activation status of the signaling pathway.
Science
The effectivity of ILP solvers is largely based on getting good lower bounds from the LP relaxation.
The effectivity of an organisational structure can only be judged by reviewers who are familiar with the socio-cultural and political environment of the institution.
Science
Expert writing Tips
Best practice
When writing, consider using the word "effectiveness" instead of "effectivity". While "effectivity" is technically correct, "effectiveness" is far more common and widely accepted in standard English.
Common error
Avoid using "effectivity" in formal writing unless it's a specific term within a technical field. The general term for the quality of being effective is "effectiveness".
Source & Trust
82%
Authority and reliability
3.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "The effectivity" functions as a noun phrase, acting as the subject or object in a sentence. It denotes the quality or degree of being effective. As Ludwig AI indicates, while valid, it's less common than "effectiveness".
Frequent in
Science
75%
Academia
15%
News & Media
10%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, while grammatically permissible, using "The effectivity" is less common and often perceived as less natural than its synonym, "The effectiveness". Ludwig AI confirms this preference. It is most frequently encountered in scientific and academic writing. For general use, opting for "The effectiveness" is advisable. However, contexts from Ludwig also show that "The effectivity" is perfectly acceptable in more technical contexts. Always consider your audience and the context when making your choice.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
The effectiveness
Replaces "effectivity" with its more common and widely accepted synonym.
The degree of effectiveness
Specifies the level or extent to which something is effective.
The power to be effective
Focuses on the inherent capacity to produce a result.
The ability to achieve results
Highlights the capability of attaining intended outcomes.
The capacity for impact
Emphasizes the potential to have a significant influence or effect.
The measure of success
Shifts the focus to quantifying how well something has succeeded.
The competence
Highlights skill or knowledge leading to effectiveness.
The efficiency
Focuses on achieving maximum productivity with minimum wasted effort or expense.
The success rate
Quantifies success as a proportion of attempts.
The performance
Describes how well a task is completed or a function fulfilled.
FAQs
What does "The effectivity" mean?
The phrase "The effectivity" refers to the ability or power to be effective, or a measure of how effective something is. However, the term "effectiveness" is more commonly used.
Is it correct to use "The effectivity" in a sentence?
While grammatically correct, using "The effectivity" may sound awkward or less natural to some readers. "The effectiveness" is generally the preferred term.
What can I say instead of "The effectivity"?
You can use alternatives like "the effectiveness", "the degree of effectiveness", or "the ability to achieve results" depending on the context.
What's the difference between "The effectivity" and "The effectiveness"?
"The effectivity" and "The effectiveness" have the same core meaning, but "The effectiveness" is far more widely used and accepted in standard English. Therefore, "The effectiveness" is the preferred choice.
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
3.8/5
Expert rating
Real-world application tested