What is time definition?

Time is generally defined as a measurable period of existence that is characterized by change. It is a concept that is widely used to measure and quantify the duration of events, processes, and movements. Time has historically been defined in a variety of ways, ranging from cyclical and linear constructions to more abstract concepts.

In physics, the standard unit of time is the second, which is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.

Time can also be perceived subjectively, and it is often influenced by various factors such as culture, language, and individual experiences. This subjective experience of time can vary based on factors such as attention, emotion, and memory.

Lastly, time is a fundamental dimension of the universe and plays a vital role in many scientific theories, such as relativity, quantum mechanics, and thermodynamics.