"predominant purpose" is a correct and usable phrase in written English.
It is used to refer to a primary or main purpose or goal. For example, "The predominant purpose of the project was to improve customer service."
The predominant purpose of entering the scheme was to achieve a tax saving".
"I have reached the firm conclusion that Mr Ashby's predominant purpose for bringing these proceedings was to pursue a political attack against Mr Slipper and not to vindicate any legal claim he may have," Rares wrote in his decision.
Rares found the "predominant purpose for bringing these proceedings was to pursue a political attack against Mr Slipper" and that Ashby "acted in combination" with another Slipper staffer, Karen Doane, and Brough "in order to advance the interests of the LNP and Mr Brough".
The predominant purpose of global planted forests has been for wood and fibre production (FAO 2010), which has also been the case in Australia and New Zealand.
There is also not much practical use for it either so its predominant purpose is as a money substitute.
The use of corn grain among other biofeedstocks has to be balanced with its longtime predominant purpose for food and feed, and other issues such as economic impacts affecting global food prices, land use, and environmental effects.
A predominant influence of technology and purpose-based ideologies has produced today's top young talent -- leaders, innovators, problem-solvers, and nose-to-the-grindstoners.
Then using a process of constant comparison, categories from all of the data sets were compared for the purpose of identifying the predominant themes.
For the purpose of this study, the predominant genetic background of the GM line was defined by the inbred strain chosen to be the source of oocytes for IVF.
Perhaps there is an internal bureaucratic reason to identify interstate highways by their predominant direction over their full length, but the purpose of posting signs is supposedly to help the driver figure out which way to go.
Despite these problems, the system has been useful in meeting the purposes of influenza surveillance, identifying the predominant circulating strains in the community and allowing the formulation of guidelines for influenza vaccine composition for the subsequent year.
