Entry 1 sense Webster, 1913 Arrearage /ẽr-ēr'-ĭj/ · Ar·rear·age · IPA /ərˈiːrɪdʒ/ 01 n. That which remains unpaid and overdue, after payment of a part; arrears. 1. That which remains unpaid and overdue, after payment of a part; arrears. “The old arrearages . . . being defrayed.” — Howell.