The Collaborative International Dictionary
Unseven
Unseven \Un*sev"en\, v. t. [1st pref. un- + seven.]
To render other than seven; to make to be no longer seven.
[Obs. & R.] ``To unseven the sacraments of the church of
Rome.''
--Fuller.
Wiktionary
unseven
vb. (context obsolete transitive English) To render other than seven; to make to be no longer seven.