inequality
This term carries a heavy sociopolitical weight, often evoking a sense of injustice or systemic unfairness. It is rarely used to describe a simple difference in size or color, but rather to highlight a disparity that is perceived as wrong or harmful, such as the difference between the rich and the poor. In technical or mathematical settings, the word loses its moral judgment and becomes a neutral descriptor of imbalance. While a social inequality is something to be fought or corrected, a mathematical inequality is simply a factual relationship between two different values.
Countable when referring to specific types of disparity, such as gender inequality or racial inequality. Uncountable when referring to the general concept of imbalance within a society.