Predominant within biotoplogy’s lexicon, approximative-rigorous abstractions basically run the show. They can with a considerable amount of accuracy mark and hold places for indeterminate things and events. The best way to give a sense of what is indeterminate or not fully ascertainable is to make an approximative-rigorous statement about it, approximately taking its measure while rigorously allowing it is proportionate date.

Approximative-rigorous abstractions: cleaving; bioscleave; landing site; architectural body.

Central to biotopology’s diagrammatic method, approximative-rigorous abstractions are the means of putting in place and maintaining appropriate level of abstraction.