Non constat
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
It is not certain; it does not appear.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Lat. It does not appear; It is not clear or evident. A phrase used in general to state some conclusion as not necessarily following although it may appear on its face to follow.