The phrase "a purpose therefore" is correct and usable in written English.
It can be used to indicate a conclusion or reasoning that leads to a specific purpose or goal.
Example: "The research findings were inconclusive; a purpose therefore was established to guide future studies."
Alternatives: "a purpose thus" or "a purpose as a result".
David Popenoe, a professor emeritus of sociology at Rutgers, once wrote, vaguely, that the "institutional purpose, and therefore the importance of the social institution in general, would surely be compromised by incorporating the marriage of same-sex couples".
As the FDA explained in a recent Federal Register notice, "statements related to quitting smoking generally create a strong suggestion that a product is intended for a therapeutic purpose". Therefore such claims cannot be made without FDA approval.
Each optimization level is designed to achieve a different purpose; therefore, relevant optimization schemes are selected for each level.
A sharpening steel's purpose, therefore, is to push back the blade's teeth so they stand up and cut again.
Any of the available general-purpose methods for optimal design and operation hardly suffices for this purpose; therefore, a specific-purpose method has been developed in the current work.
It is a misstatement of the bill's purpose, therefore, to maintain, as the McCain campaign advertisement does, that Mr. Obama favored conventional sex education as a policy for 5-year-olds.
For Rorty, then, any vocabulary, even that of evolutionary explanation, is a tool for a purpose, and therefore subject to teleological assessment.
Any newly-formed word is formed for a purpose and therefore it is reasonable to assume that the word will bear some meaning that is related to its context of use.
The proper choice for such a purpose was therefore a veno-venous bypass with large-bore drainage catheters to allow high blood flows.
