The phrase "a well defined relationship" is correct and usable in written English.
It can be used when discussing the clarity and specificity of a relationship between two or more entities, whether in personal, professional, or academic contexts.
Example: "In our research, we established a well defined relationship between the variables that significantly impacted the outcome."
Alternatives: "a clearly defined relationship" or "a precisely defined relationship".
Though we established well defined relationships of these bacteria in children and lack of thereof in adult woman, our study has some limitations.
As the data has a well defined schema, any application can reuse the data; and using the relationships, related data can be effectively organized as well as retrieved.
As a result, Polynesian cultures placed every person in a well-defined relationship to society and to the universe.
There's a well-defined relationship between a category's size and zombie rate.
It is shown that a well-defined relationship, that can be expressed as a characteristic function, exists between the system's properties, the correction matrices and the actual amount of experimental noise.
In addition to the electronic transition energies, it was observed that the Stokes shift also exhibited a well-defined relationship with increasing conjugation length, implying a correlation between the electron-vibrational coupling and chain length.
Trace fossils in the geologic record can be used to interpret the palaeoenvironmental, palaeoecologic, palaeohydrologic, and palaeoclimatic settings because a well-defined relationship exists between climate, hydrology, soils, environment, and all biodiversity.
The FRP rupture strain obtained from a split-disk test is usually less than that obtained from a flat coupon test, but there is neither a well-defined relationship between the two nor a comprehensive explanation for why they are different.
A series of novel pi conjugated polymers, originating from the archetypical Polyphenylene vinylene, in which the phenyl units are successively replaced by the larger naphthyl and anthryl acene units, were previously found to have a well-defined relationship between their relative fluorescence yields and their vibrational characteristics, as determined by Raman spectroscopy.
