An arbitrator appointed by a qazi to settle disputes. It is not lawful to appoint either a slave or an unbeliever or a slander, or an infant, as an arbitrator. (Hidayah, vol. ii, p. 638.)
According to the Qur’an, Surah iv. 39, domestic quarrels should be settled by an arbitrator: – “If ye fear a breach between the two (i.e. husband and wife) then appoint an arbitrator from his people, and an arbitrator from her people.”
Al-Hakam, the Arbitrator, is one of the ninety-nine attributes of God, although it is not so employed in the Qur’an.
Based on Hughes, Dictionary of Islam