BACKGROUND The term scope of practice (SOP) refers to the limits of a health professional's knowledge, skills and experience and reflects all tasks and activities they undertake within the context of their professional role. Inconsistency in definitions of SOP contributes to uncertainty and confusion regarding professional practice boundaries and potentially impacts societal access to safe, effective and efficient healthcare options. The aim of this paper is to understand the conceptual diversity that may exist in terminology used to describe medical, nursing/midwifery and allied health SOP within an Australian practice context exemplar. METHODS A systematic review for scoping and content analysis of SOP definitions and concepts, involving inductive thematic analysis and synthesis of published and grey literature. RESULTS The initial search strategy yielded 11,863 hits, of which 379 were suitable for inclusion. Data coding identified various SOP terms and definitions and the emergence of six, conceptual elements underpinning the theoretical construct. These were subsequently proposed as a preliminary conceptual model ('Solar') to explain how the six conceptual elements may be applied across various professions, clinical settings and jurisdictions to better understand and address current and evolving SOP issues. CONCLUSIONS The findings of this study highlight limited consistency in SOP definitions and terminology within a single jurisdiction, and the conceptual complexity of the underlying theoretical construct. Further research is required to build on the proposed 'Solar' conceptual model and create a universal SOP definition across jurisdictions, to enhance understanding of the importance of SOP to workforce policy, clinical governance, service models and patient outcomes.