The second (symbol: s) is a unit of time derived from the division of the day, first into hours, then into minutes, and lastly into seconds, for a total of 24 × 60 × 60 = 86 400 seconds per day. That …

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

Ordinal numbers in English show the position or order of things—like first, second, third, and so on. They’re used all the time in everyday English, whether you’re talking about dates, competitions, …

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

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 the time.

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

Feb 22, 2026 · Meaning of a second as a unit of time, its significance in various measurements, and related terminology, including faster and slower time intervals.

1. In the second order, place, or rank: finished second. 2. But for one other; save one: the second highest peak.