From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( n.) Simple succession, or the coming after in time, without asserting or implying causative energy; as, the reactions of chemical agents may be conceived as merely invariable sequences.

(2): ( n.) All five cards, of a hand, in consecutive order as to value, but not necessarily of the same suit; when of one suit, it is called a sequence flush.

(3): ( n.) The state of being sequent; succession; order of following; arrangement.

(4): ( n.) Three or more cards of the same suit in immediately consecutive order of value; as, ace, king, and queen; or knave, ten, nine, and eight.

(5): ( n.) A melodic phrase or passage successively repeated one tone higher; a rosalia.

(6): ( n.) A hymn introduced in the Mass on certain festival days, and recited or sung immediately before the gospel, and after the gradual or introit, whence the name.

(7): ( n.) That which follows or succeeds as an effect; sequel; consequence; result.

(8): ( n.) Any succession of chords (or harmonic phrase) rising or falling by the regular diatonic degrees in the same scale; a succession of similar harmonic steps.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]

1. The later name of the Pneuma, a melodious and varied prolongation of the Hallelujah.

2. The announcement of the Gospel of the day when taken from the middle of the Gospels, but called Initium when the opening words were to follow. On the four days of Holy Week the words "The Passion of our Lord Jesus Christ" replaced the ordinary sequence, or initial.

3. The name for a hymn in meter. (See Prose); (See Sequences).