noun
Technical term used in scientific and academic contexts to describe a lack of uniformity or the presence of diverse components.
この研究では、試料の不均質性が結果に影響を与えた。
In this study, the heterogeneity of the sample affected the results.
Compound of 不 (negative prefix), 均質 (homogeneous), and 性 (property, -ity). The exact historical derivation is uncertain, but the word follows a common pattern for forming abstract nouns in technical Japanese.