Sixth
Vine's Expository Dictionary of NT Words [1]
is used (a) of a month, Luke 1:26,36; (b) an hour, Matthew 20:5; 27:45 and parallel passages; John 4:6; (c) an angel, Revelation 9:13,14; 16:12; (d) a seal of a roll, in vision, Revelation 6:12; (e) of the "sixth" precious stone, the sardius, in the foundations of the wall of the heavenly Jerusalem, Revelation 21:20 .
Webster's Dictionary [2]
(1): ( a.) First after the fifth; next in order after the fifth.
(2): ( a.) Constituting or being one of six equal parts into which anything is divided.
(3): ( n.) The quotient of a unit divided by six; one of six equal parts which form a whole.
(4): ( n.) The next in order after the fifth.
(5): ( n.) The interval embracing six diatonic degrees of the scale.
King James Dictionary [3]
Sixth, a. The first after the fifth the ordinal of six.
Sixth, n.
1. The sixth part. 2. In music, a hexachord, as interval of two kinds the minor sixth, consisting of three tones and two semitones major, and the major sixth, composed of four tones and a major semitone.