Time is the 4th dimension. When you ask someone to meet you, you essentially give them 4 coordinates. X,y,z for spatial, and then t for time. If any of the coordinates are incorrect you will miss them.
If you are talking about additional spacial dimensions, as others have noted, it’s just a concept, we don’t have any evidence for addtional dimensions other than what’s required for string theory to work, and that’s not really evidence.
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