Palmyrean

ḳdm - before, in the presence of; in the opinion of; incumbent upon (DNWSI 988)

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’