1. Any device that activates or deactivates the components of a machine or system according to a preplanned sequence (as in a washing machine, or central heating system).
  2. A device or system that orders and/or modifies digitally stored music and sound for playback.
    a MIDI sequencer
  3. A device for determining the sequence of monomers in a polymer, especially amino acids in protein, or bases in DNA.
  4. A control device to increase/decrease the capacity of plant that is enabled to act in a specific order or sequence.

The above text is a snippet from Wiktionary: sequencer
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