Question

definition of second​

Answer 1

Answer:

second is the smallest and SI unit of time

Answer 2

The second is the base unit of time in the International System of Units, commonlyunderstood and historically defined as ¹⁄₈₆₄₀₀ of aday – this factor derived from the division of the day first into 24 hours, then to 60 minutes andfinally to 60 seconds each.

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 minute we know today.