Abstract An introduction, overview and discussion are provided for this special issue of the Biological Journal of the Linnean Society, entitled ‘Teleonomy in Living Systems’. The introduction offers a brief account of the origin of Colin Pittendrigh’s notion of teleonomy, in many ways comparable to Dobzhansky’s later proposal of ‘internal teleology’, and a subsequent externalist interpretation of the concept by Ernst Mayr which, unfortunately, has remained influential. As part of the growing movement that places organismic purpose, goal-directedness and agency back at the centre of biology, in June 2021 a 2-day online international meeting was organized by the authors through the Linnean Society of London, under the title Evolution ‘On Purpose’: Teleonomy in Living Systems. Our overview provides a summary, with some commentary, for each of 15 papers presented here. Together with a complementary volume of 18 papers published by MIT Press, they form a selected and extended proceedings. These papers represent scientifically founded views of evolutionary biologists and philosophers of science who seriously question the adequacy of the neo-Darwinian Modern Synthesis to account for the purposive nature of living systems. Like any other phenomena associated with life, purposive and teleonomic behaviours demand evolutionary explanations and context. Without any recourse to supernatural or non-material processes, various approaches to trying to understand how this goal-directed, teleonomic property of life has influenced the course of evolution are explored.
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