Of or relating to a cosmological theory proposing that the known universe originated in the collision of two other three-dimensional universes traveling in a hidden fourth dimension. This scenario does not require a singularity at the moment of the Big Bang.
[Greek ekpurōsis, conflagration, cyclically recurring conflagration in which the universe is destroyed and reborn according to Stoic philosophy (from ex, ek, out of; see eghs in the Appendix of Indo-European roots + pūr, pur-, fire; see paəw in the Appendix of Indo-European roots + -ōsis, n. suff.) + -OTIC.]
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