What does "sequence" mean?

Additional senses

1. 2.(Philos.) 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. 3.(Mus.) (a) 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. (b) A melodic phrase or passage successively repeated one tone higher; a rosalia.
3. 4.(R.C.Ch.) 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. Bp. Fitzpatrick. Originally the sequence was called a Prose, because its early form was rhythmical prose. Shipley.
4. 5.(Card Playing) (a) (Whist) 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. (b) (Poker) 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.