the state or an instance of being unequal; lack of equality
social or economic disparity
disparity of distribution or opportunity
in mathematics:
a formal statement of inequality between two expressions
a symbol denoting inequality, e.g. (≠) meaning ‘is not equal to’, (<) meaning ‘is less than’, or (>) meaning ‘is greater than’
archaic lack of evenness, smoothness, or regularity
[early French inequalité from Latin inaequalitat-, inaequalitas, from inaequalis unequal, from in-1 + aequalis: see equal1]