Question

What is time . What is the definition of time.

Answer 1

Time is an observed phenomenon, by means of which human beings sense and record changes in the environment and in the universe. A literal definition is elusive. Time has been called an illusion, a dimension, a smooth-flowing continuum, and an expression of separation among events that occur in the same physical location.
Definition
Time is something we deal with every day, and something that everyone thinks they understand. However, a compact and robust definition of time has proved to be remarkably tricky and elusive.
The fundamental unit of time in the International System of Units (SI) is the second