Impartiality, n.
Etymology: [Cf. F. impartialité.]
The quality of being impartial; freedom from bias or favoritism; disinterestedness; equitableness; fairness; as, impartiality of judgment, of treatment, etc. Impartiality strips the mind of prejudice and passion. South.
Shades of meaning
Fernald has no entry of its own for impartiality; he lists it under justice.
Where he writes about it:
In its governmental relations, human or divine, justice is the giving to every person exactly what he deserves, not necessarily involving any consideration of what any other may deserve; equity (the quality of being equal) is giving every one as much advantage, privilege, or consideration as is given to any other; it is that which is equally right or just to all concerned; equity is equal justice and is thus a close synonym for fairness and impartiality, but it has a philosophical and legal precision that those words have not. — from justice