Disparity (noun)

1. A significant difference or inequality between two or more things.
2. A lack of balance or equality between two or more things.
3. A condition of being dissimilar, unequal, or unmatched.

Origin:

From latin disparitas, meaning inequality, difference, or discrepancy.

Examples:

1. The disparity between the rich and the poor was a major issue in the country.
2. The disparity in the salaries of the employees caused dissatisfaction.
3. The disparity in the performance of the teams was noticed by the coach.
4. The disparity in the prices of the products was a concern for the consumers.
5. The disparity in the growth rates of the economies was a source of worry for the authorities.