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Time is the 4th dimension, and is completely intertwined with space. To explain why it is a 'dimension', take this example. You say to someone to meet you out the front of your house at 1:00pm. If any of those coordinates (dimensions) are incorrect (your longitude, lattitude, elevation, time) you will not meet your friend.
Anyway, the best and clearest explanations of these principles I've read is in "The Elegant Universe" by Brian Greene, and I recommend you go straight to this book.
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