What are the 9 Choirs of Angels?

St. Thomas Aquinas gave us the following hierarchical list of the nine angelic choirs, using the traditional names from the Hebrew and Greek handed on through the Latin Vulgate of St. Jerome.

Seraphim (Is. 6:2, 6, seraphin)
Cherubim (Gen. 3:24, Heb. 9:5, cherubin)
Thrones (Col. 1:16, throni)
Dominions (Col. 1:16, Eph. 1:21, dominationem )
Virtues (Eph. 1:21, virtutem)
Powers (Rom. 8:38, Eph. 1:21, potestatem)
Principalities (Col. 1:16, Eph. 1:21, principatum)
Archangels (Rev. 12:7, Jude 9, archangelus)
Angels (over 300 references, angelus)