The ability to change (or be changed) to fit changed circumstances WordNet 3.0 & Open English WordNet

Adaptability is a feature of a system or of a process. Wikipedia

Feature of a system, process, person or organization to change oneself to cope with unexpected disturbances in the environment Wikidata

Variability in respect to, or under the influence of, external conditions; susceptibility of an organism to that variation whereby it becomes suited to or fitted for its conditions of environment; the capacity of an organism to be modified by circumstances. Wiktionary

Variability in respect to, or under the influence of, external conditions. Wiktionary (translation)