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Symbol. s. The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as 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 (24 × 60 × 60 = 86400).
specifically : the base unit of time in the International System of Units that is equal to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. 2. : an instant of time : moment.
Use our handy calculator to convert between seconds and other units of time. Just type the number to convert into the box and hit the calculate button.
SECONDS definition: 1. an extra amount of food that is given after the first amount has been eaten: 2. an extra amount…. Learn more.
Seconds, time. The second (symbol: s; abbreviation: sec.) is the name of a unit of time, and is the International System of Units (SI) base unit of time. SI prefixes added to the word second denote subdivisions of the second such as the millisecond (one thousandth of a second), or multiples of the second such as the kilosecond (one thousand ...
Define seconds. seconds synonyms, seconds pronunciation, seconds translation, English dictionary definition of seconds. n. 1. a. A unit of time equal to one sixtieth of a minute. b. The time needed for a cesium-133 atom to perform 9,192,631,770 complete oscillations.
SECONDS meaning: 1. an extra amount of food that is given after the first amount has been eaten: 2. an extra amount…. Learn more.
There are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. This tradition dates back to the Babylonian . In science, a second is the time it takes for a caesium atom to vibrate 9,192,631,770 (around 9 billion) times.
second noun (TIME) A2 [ C ] ( abbreviation sec.); (s) a short unit of time that is equal to a 60th of a minute: There are 60 seconds in a minute. per second These computers process millions of instructions per second. fraction of a second The new system can trace a phone call in a fraction of a second.
second part of a minute. (sekənd ) Word forms: plural seconds. countable noun. A second is one of the sixty parts that a minute is divided into. People often say ' a second ' or ' seconds ' when they simply mean a very short time. For a few seconds nobody said anything.
