noun (1) Definition of second as in minute a very small space of time I'll be ready in a second Synonyms & Similar Words Relevance minute moment heartbeat instant split second nanosecond trice jiffy eyeblink New York minute wink twinkling twinkle microsecond flash jiff shake beat snatch spurt Antonyms & Near Antonyms age lifetime forever eternity
second noun (POSITION) [ S ] the second person or thing to do or be something, or the second person or thing mentioned: This is the second of the four tests. seconds [ plural ] informal an extra amount of food that is given after the first amount has been eaten: Would anyone like seconds of ice cream? SMART Vocabulary: related words and phrases
plural seconds. Britannica Dictionary definition of SECOND. [count] 1. a : a unit of time that is equal to ¹/₆₀ of a minute. There was a delay of several seconds. a 30- second TV commercial. phone lines transmitting data at 1,200 bits per second. The sound came on for a second or two and then went off again.
noun shortest interval of time noun support; duplicate verb support, advance a suggestion synonyms for second Compare Synonyms alternative double duplicate extra following further inferior lower place repeated reproduction runner-up secondary succeeding supporting twin additional another lesser next in order other subsequent unimportant
second ( ˈsɛkənd) adj ( usually prenominal) 1. (Mathematics) a. coming directly after the first in numbering or counting order, position, time, etc; being the ordinal number of two: often written 2nd b. ( as noun ): the second in line. 2. rated, graded, or ranked between the first and third levels 3. alternate: every second Thursday.
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second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the Sun.