inequality
/ˌɪnɪˈkwɒlətɪ/noun
(pl. -ies)［mass noun］
1- difference in size, degree, circumstances, etc.; lack of equality（大小、程度、情况等的）不同; 不平等：
social inequality
社会不平等
count noun the widening inequalities in income.收入方面越来越大的差异。
1.1
- archaic lack of smoothness or regularity in a surface〈古〉（表面）不平滑; 不规则：
the inequality of the ground hindered their footing.
地面的高低不平妨碍了他们走路。
1.2
- Mathematics the relation between two expressions that are not equal, employing a sign such as ≠ 'not equal to', > 'greater than', or < 'less than'【数】（两式间的）不等。
1.3
- count noun Mathematics a symbolic expression of the fact that two quantities are not equal【数】不等式。
词源
late Middle English: from Old French inequalite, or from Latin inaequalitas, from in- 'not'+ aequalis （see EQUAL）.