Autonomy refers to the degree to which a system participates in generating and maintaining the organisational conditions required for its own continued existence. Within APS, autonomy is not understood as independence from all external influences. Living systems are always embedded within environments, depend upon material and energetic exchanges, and participate in wider ecological and evolutionary relationships. Autonomy therefore does not mean isolation. It means that the organisational processes responsible for maintaining viability are generated and regulated by the system itself.
APS treats autonomy as an organisational property rather than a metaphysical one. A system is autonomous when its activities contribute to sustaining the conditions that make those activities possible. The system must therefore participate in the ongoing maintenance of its own persistence through processes of regulation, evaluation, repair, adaptation, and organisational continuity. Autonomy is inseparable from viability because the maintenance of viability requires an organisation capable of responding to changing circumstances while preserving its integrity through time.
Autonomy is closely related to biological agency but is not identical to it. Agency concerns the activities through which a system regulates itself in relation to its continued persistence. Autonomy concerns the extent to which those activities arise from and are maintained by the system’s own organisation. Agency describes what a system does. Autonomy describes the organisational basis that makes such activity possible.
The concept is particularly important when distinguishing living systems from systems that exhibit organisation without self-maintaining capacities. Viruses, for example, possess highly organised structures and participate in biological processes, yet they do not autonomously maintain the conditions required for their own persistence. Their replication depends upon the metabolic and regulatory organisation of host systems. APS therefore treats viruses as organisationally dependent participants in biological systems rather than as autonomous biological agents.
Autonomy should also be distinguished from complete self-sufficiency. No organism is entirely self-contained. All living systems depend upon environmental resources and exist within networks of ecological interaction. Autonomy concerns how viability is maintained, not whether external dependencies exist. A system may depend extensively upon its environment while remaining autonomous if it actively regulates those relationships in ways that sustain its own persistence.
Within APS, autonomy is one of the central organisational conditions of life. Living systems are not merely organised; they are autonomous organisations that actively maintain the conditions of their own continued existence. Understanding autonomy therefore helps clarify why some systems participate in biological processes while others constitute biological systems in their own right.