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fourth dimension


from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Time regarded as a coordinate dimension and required by relativity theory, along with three spatial dimensions, to specify completely the location of any event.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun algebraic geometry The fourth coordinate indicating a position along the fourth axis.
  • noun physics The dimension of time.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the fourth coordinate that is required (along with three spatial dimensions) to specify a physical event


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