When you want to meet some one what would you do? You give the address where to meet but is it enough? The answer is no. You also have to give a time. So to give an address to someone is meaningless if you don't give a time to meet. So you have to give address in three dimension and an extra dimension of time so total becomes 4 dimensions.
We have been taking time dimension for granted and never mentioned it until Lagrange did 1788 in his his Mécanique analytique. Strange thing is we can all experience a three dimensions and luckily we can point them our but we are trapped in this three dimension such that we cannot point towards a fourth dimension and have no clue about it how to get there.
Its like people living in flat land where everything is two dimensional including them self cannot imagine or point or travel to the fourth dimension but can deduce it by the strange appearance of the 3d object in 2d and because the existence of 2 dimension world cannot be explained. Can you image a paper lying somewhere without the third dimension. The answer is no.
Lets take a look in an elaborate way draw a line its one dimensional, duplicate the line and move perpendicular to the previous line and connect the vertices you get two dimensional figure now you pull the square out of the paper and make it solid now it became three dimensional and at last it is a little hard to explain to pull the three dimensional object in the fourth perpendicular to three dimensional figure then you will get a four dimensional figure. now I cannot explain where to point at the four dimension because the third is inside the fourth one so I have to show the outside which i clearly can't show.
Even after all this exdplaination if you still can't understand then it's not your fault, it is because we are trapped in 3d that we cannot even imagine 4d. But the fact is we do live in four dimensions. That is why we give time for meeting and not just address.
Enjoy reading and be open to the things that world has to offer.
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