In English it can be a noun or a verb. To perfect something is to make it perfect. Perfect means without flaws. In Quality and Nature that is often described as "fit for purpose".
In psychology it is important to recognize the difference between perfection as an ideal, and the inability of anyone (and probably things) to really be "perfect".
There is also a definition problem with the fact that "perfect" is a subjective target. That is because everyone's definition of the actual purpose redefines the "fitness" aspect, and therefore the condition of "flawless".