A Regularity is a uniformity or similarity that exists in multiple entities or at multiple times. (Bertalanffy 1968).
Bertalanffy, L. von. 1968. General System Theory: Foundations, Development, Applications, Revised ed. New York, NY, USA: Braziller.
The existence of similarities and differences between systems from different domains is one of fundamental ideas behind Systems Thinking (see Concepts of Systems Thinking)
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