Background: To produce a conceptual and operational definition of transition, in the context of end-of-life care, as experienced by informal caregivers. Methods: The authors used Rodgers' (2000) concept analysis framework to examine this concept. Findings: Common themes emerged using Rodgers' (2000) inductive approach confirming transition for informal caregivers at the end of life as a process comprising the presence of trigger(s)/event(s), awareness, instability and engagement/learning while maintaining normality. There was also duration to this process that was often unknown and unpredictable. This concept analysis provides useful insight into understanding the complex dynamics of transition during this period. The primary antecedent of this concept, prompting transition, is a diagnosis of non-curative disease for the patient. In some cases, a gradual realisation rather than a formal diagnosis that the illness has progressed to a non-curative stage, can also be an antecedent. Transition during end-of-life-care for informal caregivers can be a highly emotional time for this vulnerable cohort. Effective transitioning can ensure a stability and quality end-of-life outcomes, such as a peaceful death, as the awareness and learning that it brings, prompts planning actions for terminal care. Conclusions: Through recognising the findings of this concept analysis, deeper insight may be gained to support the provision of care, by nurses, to informal caregivers, prompting them towards effective transitions that foster the best interest of the patient.