Could someone explain the fourth dimension?

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Could someone explain the fourth dimension to me? I understand that it represents time. Could anyone thoroughly explain the concept? Thank you.
 
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Thanks for the suggestion.
I've read about the fourth dimension online, and was wondering if anyone could thoroughly explain the concept.
 
Well let's say that you are having an interview for a job. In order to meet this person for the hypothetical interview you would have to go to the corner of 25th st.(length) and MLK(width) then up to the 6th floor(depth), then for the fourth dimension you need to know what time the interview takes place(3 p.m.)
 

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