inequality
US /ˌɪn.ɪˈkwɑː.lə.t̬i/
UK /ˌɪn.ɪˈkwɑː.lə.t̬i/

1.
difference in size, degree, circumstances, etc.; lack of equality
:
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There is a growing inequality between the rich and the poor.
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The report highlighted the inequality in access to education.
2.
a mathematical statement that two quantities are not equal
:
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The problem involved solving a complex inequality.
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Students learned how to graph linear inequalities.