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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
atomic clock
1.
atomic clock
(artifact)
a timepiece that derives its time scale from the vibration of atoms or molecules
Broader (hypernym)
horologe
,
timekeeper
,
timepiece
Narrower (hyponym)
ammonia clock
,
caesium clock
Based on WordNet 3.0 copyright © Princeton University.
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. English edition:
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