Noun Concept
Categories: UCUM base units, Units of time, Articles with short description, Orders of magnitude (time), All Wikipedia articles written in American English
second  sec  s
1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites WordNet 3.0
The second is the base unit of time in the International System of Units, commonly understood and historically defined as ​1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each. Wikipedia
SI unit of time, defined as 9 192 631 770 periods of the ground-state hyperfine transitions of caesium-133 Wikidata
One-sixtieth of a minute (as it is the second division of the hour, the minute being the first). OmegaWiki
Second, 1⁄60 of a minute. Wiktionary
One-sixtieth of a minute; the SI unit of time, defined as the duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of caesium-133 in a ground state at a temperature of absolute zero and at rest. Wiktionary
One-sixtieth of a minute; SI unit of time. Wiktionary (translation)