Tigrinya

ḳədmi - before, prior to, previous to, preparatory to, earlier, ago, in front of, forward, at first, ahead, ahead of (TED 1035)

PS
*ḳVdm - in front of, before (Arakelova 2001:46, Kogan 2015:395)
The preposition is considered to be derived from the verbal root *ḳdm ‘to be in front, to precede’