Wiktionary
vb. 1 (context humorous intransitive English) To become compact or more compact. 2 (context humorous transitive English) To render (a thing) compact or more compact. 3 (context mathematics transitive English) To enlarge (a topological space) in order to render it compact. 4 (context physics transitive English) To adjust a theory so as to render finite or periodic (a theoretical space-time dimension).
Usage examples of "compactify".
All but four of those dimensions are compactified - rolled up to an unimaginable thinness.
All of its limbs were compactifying now, the tissue contracting as the steel skeleton flaked away inside.
The seven compactified dimensions were rolled into the topological equivalent of tight tubes, with diameters well within the Planck length, the quantum limit to measurement of size.