Literally: That restrains, curbs, checks. A judge, also, an arbitrator. A ruler, also, a lawgiver, a legislator.
Allah Who is the Absolute Judge of all, the Giver of Justice. The One Who distinguishes right and wrong and judge with justice. The One Who always overpowers. Victorious. One Whose judgments and decrees are never overturned or thwarted. The One Who rules without the intervention of others.
The words Hâkim, Hakam and Hakîm both derived from the same root ح ك م , but Hakam is a verbal noun which emphasizes the delivery of justice, while Hakîm is a noun which indicates the essential nature of the possessor of hikmah, and Hâkim is a noun which indicates the essential nature of the possessor of rule and decree (Hukm).