Originally, the second was known as a "second minute", meaning the second minute (i.e. small) division of an hour. The first division was known as a "prime minute" and is equivalent to the …

The meaning of SECOND is next to the first in place or time. How to use second in a sentence.

SECOND definition: 1. immediately after the first and before any others: 2. the position in which a person finishes a…. Learn more.

Oct 15, 2025 · 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 …

Define second. second synonyms, second pronunciation, second translation, English dictionary definition of second. n. 1. a. A unit of time equal to one sixtieth of a minute. b. The time …

second SI base unit Name Symbol Quantity second s time The second, symbol s, is the SI base unit of time. The second is defined by taking the fixed numerical value of the caesium …

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SECOND definition: next after the first; being the ordinal number for two. See examples of second used in a sentence.

SECOND definition: 1. referring to the person, thing, or event that comes immediately after the first: 2. 2nd written…. Learn more.