The most common and most likely answer to this crossword clue is the 5 plus 4 letter word SPACE TIME
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More clues leading to the result SPACE TIME
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The cryptic/wordplay part
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What does SPACE TIME mean?
SPACE TIME noun- The four-dimensional continuum of the three spatial dimensions plus time.
- An n-dimensional continuum consisting of dimensions of both space and time. Normally spacetime is considered as having 4 dimensions (x, y, z, t), but higher-dimensional spacetimes are often encountered in theoretical physics, e.g. the 5-dimensional spacetime of Kaluza-Klein theory or the 11 dimensions of spacetime in M-theory.
- A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity.