SECOND Definition & Meaning - Merriam-Webster
The meaning of SECOND is next to the first in place or time. How to use second in a sentence.

SECOND | English meaning - Cambridge Dictionary
There are two good reasons why we can't do it. First, we can't afford it, and second, we don't have time. 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. just be a second "Come on, hurry up!"

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Second | Measurement, Timekeeping, Clock | Britannica
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.

Second - Simple English Wikipedia, the free encyclopedia
A light flashing once per second. The second (symbol: s), is a unit of time. There are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. This tradition dates back to the Babylonians. In science, a second is the time it takes for a caesium atom to vibrate 9,192,631,770 (around 9 billion) times. Scientists measure the second this way because the length of a day changes all ...

SECOND | definition in the Cambridge English Dictionary
There are two good reasons why we can't do it. First, we can't afford it, and second, we don't have time. 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. just be a second "Come on, hurry up!"

Second - definition of second by The Free Dictionary
One of two equal parts.

What a Second Really Means in Modern Timekeeping - worldtimedata
Discover how the second is measured 🕒 , why Earth’s rotation is not precise enough, and how atomic clocks define the world’s base unit of time.

second - WordReference.com Dictionary of English
one who expresses formal support of a motion. an act or instance of such support: There is a motion before you; do I hear a second? Business [countable] Usually, seconds. [plural] goods of less than the highest quality.

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