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 …

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.

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

Second definition: A brief interval of time; a moment.

He got out with seconds to spare. see also split second Wait a second—this email's been sent to me by mistake. This will only take a second. I hesitated for a second before speaking. For a second I …

The term "second" has a number of different meanings in the context of math and numbers. Possibly the most important is that it is the base unit of time in the International System of Units (SI).

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

A second may be one-sixtieth of a minute or the item after first. If you ask whether you're second in line, the hostess might reply, "Give me a second and I'll tell you." Different meanings of the word second …