a device for the automatic determination or regulation of a sequence.
Biochemistry. a device that can sequence nucleic acids or protein.
an electronic device or software program that digitally stores sound for modification and playback through a synthesizer.

1970–75; sequence + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sequencer (ˈsiːkwənsə)
1.  an electronic device that determines the order in which a number of operations occur
2.  an electronic device that sorts information into the required order for data processing
3.  a unit connected to a synthesizer, which is capable of memorizing sequences of notes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

sequencer definition

Any system for recording and/or playback of music via a programmable memory which stores music not as audio data, but as some representation of notes. The most common modern usage of "sequencer" is to refer to systems (whether in software, or as a feature of devices like synthesizers or drum machines) that deal with MIDI data.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Meanwhile, the worm sequencer results are already providing valuable clues to researchers.
Obviously, it's better to own your own gene sequencer than having to share with a couple of other labs.
Tabs default to the main guitar track, but you can choose to see any instrument for which a sequencer track has been included.
The sequencer also runs cool and needs only standard voltage power sources.
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