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. See (Ephesians 6:12)
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.