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1Mathematics

A space that is wholly contained in another space, or whose points or elements are all in another space.*‘Gallarati studied properties of varieties whose tangent spaces meet certain linear subspaces along spaces of dimension higher than expected.’**‘He represented subspaces of a space by coordinates leading to point mapping of an algebraic manifold now called the Grassmannian.’**‘Kaluznin also worked in the area of geometrical algebra, particularly on arrangements of subspaces in Euclidean and unitary spaces.’**‘As in decision trees, the internal nodes in a qualitative tree specify conditions that split the attribute space into subspaces.’**‘We may ask that the function be differentiable on one-dimensional subspaces; here one is led to the theory of the Gâteaux differential.’*

2mass noun (in science fiction) a hypothetical space–time continuum used for communication at a speed faster than that of light.

*‘The warp technology of Star Trek, however, allows a spacecraft and its inhabitants to travel many times faster than light by moving through subspace, a theoretical parallel universe in which Einstein's theories do not apply.’**‘As quickly as the ship slipped into subspace, the light hole flashed away leaving no trace it ever had existed.’**‘I did not know your race had the capability of subspace communication.’**‘He regrets only that they never learned how to use subspace communication through the Tempest's interference, so he could give a final report to Central Command.’**‘Serves me right: apparently (and this was explained to me very carefully before I moved here) there's a ring of fractalized subspace around the entire block.’*

**Pronunciation**

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