clockwork

[klok-wurk]
noun
1.
the mechanism of a clock.
2.
any mechanism similar to that of a clock.
Idioms
3.
like clockwork, with perfect regularity or precision: The launching of the spacecraft went off like clockwork.

Origin:
1620–30; clock1 + work

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World English Dictionary
clockwork (ˈklɒkˌwɜːk)
 
n
1.  the mechanism of a clock
2.  any similar mechanism, as in a wind-up toy
3.  like clockwork with complete regularity and precision

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

clockwork
1660s, "mechanism of a clock," from clock + work. Fig. sense of "anything of unvarying regularity" is recorded earlier (1620s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He has never directly observed the clockwork precision of its fulfillment system.
We are now a bimonthly publication, coming out regular as clockwork six times a year.
After going through its share of growing pains, it now operates with clockwork efficiency.
The keeper had to manually rewind the clockwork apparatus each day.
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