appoint, command, give, (set in) order, ordain

Concise Bible Dictionary:

In the New Testament there are ten words translated “ordain.” The passages that might seem to have some reference to the impartation of a sacerdotal supremacy are:
1. Christ ordained his twelve apostles (Mark 3:1414And he ordained twelve, that they should be with him, and that he might send them forth to preach, (Mark 3:14)). Here the word is ποιέω, “to do, make.”

Strong’s Dictionary of Greek Words:

Greek:
διατάσσω
Transliteration:
diatasso
Phonic:
dee-at-as’-so
Meaning:
from 1223 and 5021; to arrange thoroughly, i.e. (specially) institute, prescribe, etc.
KJV Usage:
appoint, command, give, (set in) order, ordain