Second definition is - next to the first in place or time. Define seconds. The second (symbol: s, abbreviation: sec) is the base unit of time in the International System of Units (SI) (French: Système International d’unités), 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. Scientists measure the second this way because the length of a day changes all the time. What is epoch time? Understand the difference between Seconds and Twos. 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 seconds). The second (symbol: s), is a unit of time.There are around 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. Your detected location is New York, United States.New York, United States. Some systems store epoch dates as a … is the name of a unit of time, and is the International System of Units (SI) base unit of time. n. 1. a. A unit of time equal to one sixtieth of a minute. Find 137 ways to say IN A SECOND, along with antonyms, related words, and example sentences at Thesaurus.com, the world's most trusted free thesaurus. Time: a particular point at which an event takes place. Time.is automatically displays the time in your time zone by using your IP address to detect your location. 21 synonyms of time from the Merriam-Webster Thesaurus, plus 61 related words, definitions, and antonyms. In science, a second is the time it takes for a caesium atom to vibrate 9,192,631,770 (around 9 billion) times. The words Seconds and Twos might have synonymous (similar) meaning. A minimal display of only the seconds on a Digital Clock. This tradition dates back to the Babylonian.. How to use second in a sentence. Keep track of the seconds as they pass! Find another word for time. The Unix epoch (or Unix time or POSIX time or Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (in ISO 8601: 1970-01-01T00:00:00Z).Literally speaking the epoch is Unix time 0 (midnight 1/1/1970), but 'epoch' is often used as a synonym for Unix time. The time needed for a cesium-133 atom to perform 9,192,631,770 complete oscillations. Your IP address is 40.77.167.64. See more. The second (symbol: s; abbreviation: sec.) seconds synonyms, seconds pronunciation, seconds translation, English dictionary definition of seconds. Second definition, next after the first; being the ordinal number for two. b. Synonyms for a second time in English including definitions, and related words. Find out what connects these two synonyms. Or time a unit of time, and antonyms definitions, and antonyms International System Units... - next to the first in place or time ; being the ordinal number for two length of a of... 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