Answer: inequality

AnswerCrossword Clue
INEQUALITYSociologist's concern
INEQUALITYCivil rights problem.
inequalitylack of equality
inequalityLack of smoothness or regularity in a surface
inequalityDifference in size, degree, circumstances, etc.; lack of equality
inequalityA symbolic expression of the fact that two quantities are not equal