Lewis Short
(verb) : ex-auctōro, āvi, ātum, 1, Milit. t. t.
* To discharge from service (after sixteen years of service, before the end of the usual term of twenty years, i. e. before the regular missio; see missio. This discharge was either an honorable one or a punishment. The honorably discharged soldiers remained four years in the army as a separate corps under a vexillum, with peculiar privileges; cf. mitto, dimitto).
* Prop.
* Of an honorable discharge (not ante-Aug.): omnes milites exauctorati domum dimitterentur,Liv. 32, 1; 25, 20; 29, 1; 36, 40 fin.; 41, 5 fin.; Suet. Tib. 30; Tac. A. 1, 36 fin.: milites licentia sola se, ubi velint, exauctorent,Liv. 8, 34, 9.
* Trop.: verba exauctorata a sequenti aetate repudiataque,discarded, obsolete,Macr. S. 1, 5.
Charlton T. Lewis, Charles Short, A Latin Dictionary