From The Collaborative International Dictionary of English v.0.48:
Grievance \Griev"ance\, n. [OF. grevance. See Grieve, v. t.]
1. A cause of uneasiness and complaint; a wrong done and
suffered; that which gives ground for remonstrance or
resistance, as arising from injustice, tyranny, etc.;
injury.
[1913 Webster]
2. Grieving; grief; affliction.
[1913 Webster]
The . . . grievance of a mind unreasonably yoked.
--Milton.
Syn: Burden; oppression; hardship; trouble.
[1913 Webster]