the duration of things that are subject to change

The word time is derived from the Latin word "tempus" and since ancient times it has designated a non-tangible unit. ... 

From physics it is possible to define time as the separation of events that are subject to change. It is also understood as a flow of events. In this way events are organised in sequences, making it possible to determine the future, the present and the past.

  • In relativistic mechanics the values of time can vary according to the observer; their reference system used and the point at which they are located. 


In philosophy, time has been defined in different ways from the ancient Greeks until today.

  • The Aristotelian concept relates the notion to movement, as in physics – the measure of movement in relation to what preceded and what happened.

  • Other philosophers such as St. Augustine