Easton's Bible Dictionary (1897)
An umpire or arbiter or judge (Job 9:33). This word is formed from the Latin diem dicere, i.e., to fix a day for hearing a cause. Such an one is empowered by mutual consent to decide the cause, and to “lay his hand”, i.e., to impose his authority, on both, and enforce his sentence.
Smith's Bible Dictionary (1863)
an old English term meaning umpire or arbitrator . (Job 9:33)