The Collaborative International Dictionary of English v.0.48:

Abannation \Ab`an*na"tion\ ([a^]b`[a^]n*n[=a]"sh[u^]n),
Abannition \Ab`an*nition\ ([a^]b`[a^]n*n[i^]sh"[u^]n), n. [LL.
   abannatio; ad + LL. bannire to banish.] (Old Law)
   Banishment. [Obs.] --Bailey.
   [1913 Webster]