Definition from hubcap
“Systems thinking is the process of understanding how things, regarded as systems, influence one another within a whole. As an approach to problem solving, it means viewing "problems" as parts of an overall system, rather than reacting to specific part, outcome or event.”
Going further
I've curated 400+ definitions just like this one in a tiny dictionary. In this glossary you can easily access, search and understand 400+ terms that service designers and other innovators use.