The phrase "a valid definition of" is correct and usable in written English.
You can use it when discussing the accuracy or acceptability of a particular definition in a specific context.
Example: "The term 'democracy' has a valid definition of a system of government by the whole population or all eligible members."
Alternatives: "an acceptable definition of" or "a legitimate definition of".
We develop a valid definition of technological radicalness which states that a successful radical invention is: (1) novel; (2) unique; and (3) has an impact on future technology.
Multilevel structural equation modeling revealed that dispositional teacher enthusiasm positively predicted students' interest, which was fully mediated by students' perceived enthusiasm, providing the basis of a valid definition of teacher enthusiasm.
After the success of Men in Black 3 – although that's a relative term, based on whether or not you believe "slightly better than Men in Black 2" to be a valid definition of success – the site would have you believe that Will Smith is only interested in making sequels from now on.
On its own, a lower cost isn't a valid definition of efficiency: efficiency would entail achieving an equivalent benefit for that lower cost.
The goal hence is not to provide a valid definition of domestication but rather to examine the representations related to it.
However, we did not find a valid definition of a relevant change in both anchors.
We propose that a more valid definition of recovery should define a change point until which the syndrome is relatively continuous, but after which a return of the syndrome will become reasonably unlikely.
14 Although recently a new definition of remission was proposed, a fully valid definition of remission for RA is still not available, even though the most stringent ones seem to be better in terms of predicting long-term outcomes.
A very valid definition of biography is that it is "a fiction conceived within the bounds of the observable facts".
Remission was defined as achieving a MADRS of 10 or less at any assessment, as this cutoff has been shown to provide a valid definition [34].
There is thus still a lack of reliable molecular markers and valid definition of a high quality oocyte have impeded the selection of optimal oocytes necessary for assisted reproductive techniques (ARTs) at a high efficiency in humans as well as farm animal species.
