Definition of compactification
1 : a compact topological space that contains a given topological space as a subset or that contains a subset homeomorphic to the given topological space
2 : the application of a topological compactification to a model of the universe (such as one involving superstrings) in which the ordinary dimensions of space are held to coexist with several other dimensions too infinitesimal in size to observe
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Origin and Etymology of compactification
1compact + -ification (as in saponification)
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