exclūsĭo, ōnis, f. [excludo],
a shutting out , exclusion (very rare; not in Cic.): de exclusione verbum nullum, Ter. Eun. 88: ventorum, Vitr. 1, 6: exceptio est quasi quaedam exclusio, etc., Dig. 44, 1, 2.
exclūsiō ōnis, f ex + CLAV-, a shutting out, exclusion , T. ...
An Elementary Latin Dictionary