Smith's Bible Dictionary (1863)
In several passages of the New Testament the term “principalities and powers” appears to denote different orders of angels, good or bad.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
PRINCIPAL'ITY, in the expression "principalities and powers," Dan Eph. 1:2l; Deut 3:6; Col 1:16; Num 2:10, etc., denotes an order of angels.