The phrase "absence of a unique" is correct and usable in written English.
It can be used in contexts where you want to describe a lack of something that is distinct or one-of-a-kind.
Example: "The absence of a unique solution to the problem has led to ongoing debates among the experts."
Alternatives: "lack of a distinct" or "nonexistence of a singular".
Our sample comprising patients with nonepileptic seizures showed a significant degree of psychopathology and absence of a unique character substrate.
We have also specified particular combinations of identifiable parameters, and these should be used in model fitting to avoid obvious numerical problems, of lack of convergence and absence of a unique set of parameters maximizing the likelihood.
This is demonstrated by the absence of a unique leading edge, shown by actin cytoskeleton staining.
Another limitation in our study is the absence of a unique consensus definition for respiratory tract infections.
Building a master patient index is challenging in the U.S. because of the absence of a unique identifier, and building and maintaining such an index is laborious.
A particular strength of our study was thus the ability to carry out linkage despite the absence of a unique common identifier.
In the absence of a shared, unique key, record linkage involves the comparison of ensembles of partially-identifying, non-unique data items between pairs of records.
The absence of any unique pattern on the GBM genotype and the influence of low prevalence mutations suggest that a better description of the copy number data can be achieved if individual characteristics of each sample is considered instead of a summary for the whole population.
In the absence of any unique approach, we were arbitrary in our definition of categories.
Data were scored as the presence or absence of zymogram of a unique pattern.
Given the absence of a clause requiring unique realizability, ramseyfications counseled modesty: the structure that is identified remains indeterminate to just that degree to which theoretical terms remain incompletely interpreted (Carnap 1961b).
