The term ‘nanomedicine’ has many definitions, but none of them are generally accepted.‘Nanomedicine' is an interdisciplinary area, where nano-science, nano-engineering, and nanotechnology interact with life sciences.
Medicine is the study/cycle of diagnosis, treatment, monitoring, prediction, and prevention of diseases supported by technology. Importantly, the term could also mean a substance, which promotes healing. So, Nanomedicine is the study/cycle of the same activities supported by nanoscience, -engineering and nanotechnology. The term could also mean a substance, which promotes healing and was made from nanomaterials. "Precision" in this content is synonym of 'rigorous'.
‘Nano’ is a size-range, which is bigger than atoms and molecules, but smaller than human cells. As an example, subcellular structures (DNA, etc.) are nano-sized objects. There are competing Nanomedicine journals, too.