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.
Origin of ekpyroticGreek ekpur&omacron;sis, conflagration, cyclically recurring conflagration in which the universe is destroyed and reborn according to Stoic philosophy (from ex, ek, out of; see eghs in Indo-European roots + p&umacron;r, pur-, fire; see pa&schwa;w&rlowring; in Indo-European roots + -&omacron;sis, n. suff.) + –otic.