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'first small part', i.e. first division of the hourdividing it into sixty, and "second" comes from pars minuta secunda, 'second small part', dividing again into sixty.

Uses

Analog clocks and watches often have sixty tick marks on their faces, representing seconds (and minutes), and a "second hand" to mark the passage of time in seconds. Digital clocks and watches often have a two-digit seconds counter.

SI prefixes

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