A complete shift, as from one system to another.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "switchover" in a sentence
"At SRB separation, a switchover is made from the SRB RGAs to the orbiter RGAs."
"The advantage to the switchover is that it frees up old analog TV frequencies for use by portable handheld devices."
"The stand-out figures from the first survey are that while 82% of households know that a digital TV switchover is taking place, less than 1% know exactly when that’s happening."