polydispersity
Noun
Meaning
(uncountable) The state of being polydisperse
(countable) A measure of the degree to which a colloid is polydisperse
Source: en.wiktionary.orgExamples
Although the polymer polydispersity and molecular weight may be improved, these methods may introduce additional processing requirements to isolate the product from a solvent.
This phenomenon is called monodispersity in contrast to the polydispersity encountered in synthetic polymers.