Definition of "Recombination"
Recombination
proper noun
(cosmology) The epoch of recombination of the Universe, where atomic matter formed from free particles, combining protons with electrons. One of the Ages of the Universe. The cosmic era when neutral hydrogen formed out of the cosmic soup of protons and electrons in plasma, that condensed out of the energy of the Big Bang. This era produces the Cosmic Microwave Background (CMB).