1. for an intervening time
; - Example: "elected to serve ad interim"
The Collaborative International Dictionary of English v.0.48:
Ad interim \Ad in"ter*im\[L.]
WordNet (r) 3.0 (2006):
adv 1: for an intervening time; temporarily; "elected to serve
Bouvier's Law Dictionary, Revised 6th Ed (1856):
AD INTERIM. In the mean time. An officer is sometimes appointed ad interim,
when the principal officer is absent, or for some cause incapable of acting
for the time.