The study describes growing interest of self-directed learning (SDL) on the field of adult education. Looking at its origin the idea is complex and rich. There are many parallel ideas and theories within the phenomenon self-directed learning. As many related components are used in a similar way the idea of is fraught with confusion. In English language there is a strong need and some wide research had been undertaken to clarify the meanings of related concepts as well as the meaning of the idea of SDL. In order to avoid misunderstandings in implementation self-directed learning in Polish theory we have to clarify the independent concept that will describe the exact meaning meant by authors rather than to use already existing expressions which have their original meaning much different from the idea of self-directed learning. In the study the new expression in Polish language has been defined and explained.