Ad interim
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
In the meantime.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In the mean time. An officer ad interim is one appointed to fill a temporary vacancy or to discharge the duties of the office during the absence or temporary incapacity of its regular incumbent.