The original purpose refers to the primary intention or goal for which something was created, designed or established. It is the reason why something came into existence in the first place and serves as a guidepost for its use and application.
The industrial - chic design pays homage to the building's original purpose as a pumping station. (visitphilly.com)
It is an ancient breed whose original purpose was a farm and hunting dog but has recently become more popular as a companion dog. (en.wikipedia.org)
Hopefully this will demonstrate just how diverse the traditional art form of silhouette cutting has become since it's original purpose as a substitute for the yet to be invented camera. (blog.feedspot.com)