kept. Same as "preserved", Jude 1:1.
their first estate. their own principality (App-172.) Compare Ephesians 1:21; Ephesians 3:10; 2 Chronicles 1:16; 2 Chronicles 1:16; Colossians 2:10; Colossians 2:15.
habitation. Greek. oikiterion. Only here and 2 Corinthians 5:2.
reserved. Same as "kept", above.
everlasting. App-151.
chains. Greek. desmos. Not same word as Revelation 20:1.
under. App-104.
darkness. See 2 Peter 2:4.
judgment. App-177.
day. See Matthew 25:41.Revelation 20:10; Revelation 20:11.