seconde (L18663)
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(L18663)
Statements
Identifiers
Senses
L18663-S1
English | SI unit of time, defined as 9 192 631 770 periods of the ground-state hyperfine transitions of caesium-133 | |
French | unité du système international |
Statements about L18663-S1
Forms
L18663-F1
L18663-F2