switchover

[swich-oh-ver]
noun
1.
the act or process of changing from one power source, system, etc., to another.
2.
an act or an instance of changing from one job, belief, style, etc., to another.

Origin:
1925–30; noun use of verb phrase switch over

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World English Dictionary
switchover (ˈswɪtʃˌəʊvə)
 
n
the act or an instance of changing from one method, policy, or technology to another: the switchover to digital television

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It's the parent company and the switchover may not include all signage yet, but
  it seems well on the way.
Almost all residential thermostats require manual switchover between heating
  and cooling.
Causes the switchover operation to fail if any application sessions are open.
Uninterruptible flow switchover implemented for standby pumps.
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