This article focuses on the interpretation of the terms “sport” and “professional sport”. It is emphasized that proper interpretation of such notions is important to promote clarity and precision in delineating the scope of professional sport and analyzing laws and regulations applicable to this sphere. The author's consolidation of the creative interpretations reveals that “professional sport” embodies a complex network of profit-based social relations, intricately tied to a publicly engaging performance executed by paid full-time athletes. This performance is governed by a set of rules, principles, and approaches established and controlled by specialized entities and institutions. The article concludes that this understanding can further serve as the groundwork for further research and analysis aiming to substantiate the underlying theoretical foundations of legal regulation in professional sport.