Source : Webster's Revised Unabridged Dictionary (1913)

Arrearage \Ar*rear"age\, n. [F. arr['e]rage, fr. arri[`e]re, OF.
   arere. See {Arrear}.]
   That which remains unpaid and overdue, after payment of a
   part; arrears.

         The old arrearages . . . being defrayed. --Howell.