Validation, a short guide part I – What is validation?
The word “validation” by itself has a few meanings. The Dictionary of the Polish Language defines validation as “the generality of actions performed with the aim of checking the appropriateness, relevance or accuracy of something” .
Wikipedia provides various definitions of this word, depending on the field, in which it is used. For example, validation “in technical science and information technology is the action performed in order to obtain a confirmation, in a documented manner being consistent with the assumptions, that the procedures, processes, devices, materials, activities and systems truly lead to obtaining the pre-planned results.” 
One of online dictionaries of the Polish language provides three definitions of this word. The last of them is very close to our context: “formerly: confirmation, becoming effective” .