Lewis Short
(adjective) : suppŏsĭtīcĭus (subpŏs-) or -tĭus, a, um, suppono, I. B.
* Put in the place of another, substituted. *
* In gen.: Hermes supposititius sibi ipsi, is his own substitute, i. e. he needs no one to replace him in combat, Mart. 5, 24, 8.
* In partic., not genuine, false, supposititious: mater,Varr. R. R. 2, 8, 2: explorator,Plaut. Ps. 4, 7, 71.
Charlton T. Lewis, Charles Short, A Latin Dictionary