Question

what is 4th Dimension?

Answer 1

A four-dimensional space or 4D space is a mathematical extension of the concept of three-dimensional or 3D space. Three-dimensional space is the simplest possible generalization of the observation that one only needs three numbers, called dimensions, to describe the sizes or locations of objects in the everyday world.

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Answer 2

Time is considered by many to be the fourth dimension because it is a fourth perceivable dimension to our reality; that is to say, things occur at a specific point in space & at a specific instant in time.