The phrase "a primary purpose of" is correct and usable in written English.
You can use it when discussing the main objective or goal of something, such as a project, policy, or initiative.
Example: "A primary purpose of this initiative is to improve community engagement and participation."
Alternatives: "a main objective of" or "a key aim of".
Isn't a primary purpose of religion to help answer the question of why we exist?
Cases can now be pursued when surveillance is a "significant" rather than a "primary" purpose of the investigation.
Indeed, a primary purpose of the judiciary is to balance the periodic excesses of the other branches.
A primary purpose of the campaign, he added, is "to make sure that doesn't become a phenomenon".
"To Renew America" marks the moment that persuasion faded as a primary purpose of political talk and preaching to the choir took over.
A primary purpose of action research is to produce practical knowledge that addresses issues of concern in personal and professional life.
We have seen that the relation between sovereign and the governed had for a primary purpose the protection of the latter's civil interests.
In Davis v. Washington and Hammon v. Indiana, both involving police interrogation, the Court adopted a "primary purpose" test which allowed admission of statements seeking help in an "ongoing emergency" which were not made for the "primary purpose" of describing past events potentially for trial, based on an objective assessment of the "circumstances".
The second is that a clear distinction should also be made between writing a thesis (the primary purpose of which is, arguably, to pass a viva) and other forms of academic writing - from conference papers to grant applications, and perhaps most divisively, blogs.
It's tempting to see it as a vacation but the primary purpose of a typical business trip is, well, business.
Each lid is stamped with a code; the primary purpose of this is consumer protection - the cans can be readily recalled if anything went wrong in the canning process.
