[v., adj. pree-set; n. pree-set]
verb (used with object), preset, presetting.
to set beforehand.
to set (an electric or electronic appliance) to become activated at a designated time: We preset the coffeemaker to go on at 6 a.m.
to adjust (a connector, switch, or the like) so that when activated it will perform a designated function: The tuning buttons on the radio are preset to my favorite FM stations.
set in advance: a preset radio adjusted to receive certain stations.
(of the guidance system of a missile or the course of flight it determines) set before launching to reach a specific destination without any alteration in response to signals from the ground.
a knob or button that activates a preset appliance: Just push the preset and coffee will be ready when you get up.
a similar device on a radio that can be activated to tune in a preselected station.

1930–35; pre- + set

presettable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
preset (prɪˈsɛt)
vb , -sets, -setting, -set
1.  to set (a timing device) so that something begins to operate at the time specified
2.  electronics a control, such as a variable resistor, that is not as accessible as the main controls and is used to set initial conditions

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It then glides back and forth across the ocean floor on a ten-minute preset
  test mission under a harbor of unsuspecting sailboats.
Some people's genes are preset for maximal athletic performance.
These provide reasonable color accuracy when the light source matches one of
  the preset white balance options.
Radar gun emits a continuous stream of microwaves at a preset frequency.
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