"Specific purpose" refers to a particular and clearly defined goal or objective that you want to achieve. It helps you stay focused and direct your effort towards accomplishing something specific. Full definition
Developing a cleaner - label product can be a complex process, as it often involves removing or replacing highly functional ingredients traditionally used for specific purposes in food formulation. (foodnavigator-asia.com)
Although this facilitating position is becoming more common, little is currently understood about specific purposes of this role and the forms it might take. (ciera.org)