Inequality

[Sarah]

An expression consisting of two unequal quantities, with thesign of inequality (> or <) between them; as, the inequality 2 < 3,or 4 > 1.

[Mary Mallozziberg]

the unfair situation in society when some people have more opportunities, money, etc. than other people:

[Tracie Lynn]

Difference in size, degree, circumstances, etc.; lack of equality.

[Rihanna]

[Inequality] means something that is not [equal] to [something else]. Such as less than and greater than.