What is the meaning of Grievance?

Something which causes grief.

A wrong or hardship suffered, which is the grounds of a complaint.

Feelings of being wronged; outrage; resentment, bitterness or anger.

A complaint or annoyance.

A formal complaint, especially in the context of a unionized workplace.

Violation of regulations or objectionable behavior.

Alternative form of grevance

Source: wiktionary.org