Crowdsourcing is a relatively new concept, however raising more and more interest of researchers. Although crowdsourcing is more and more often the subject of scientific research, one can find many ambiguities in the literature, which stem from the proliferation of various research approaches and perspectives. The aim of this article is to try to systematize the concept of crowdsourcing in the perspective of management sciences. For the needs of this article a semantic analysis of 121 definitions of crowdsourcing, identified based on a review of articles in journals available in international databases: Ebsco, Elsevier/Springer, Emerald, Proquest, ISI Web of Science, Scopus, and Wiley, has been conducted. Based on the conducted semantic analysis one can ascertain that crowdsourcing is collated with outsourcing, open innovations, partner production, user innovations, open source, social consultations, or civic budget. These terms are sometimes used interchangeably, almost synonymously, which does not facilitate drawing the lines between them.