Definition of reionization in English:

reionization

(also reionisation)

noun

  • 1Physics
    The action of ionizing something for a second or further time; an instance of this.

  • 2Astronomy
    The ionization of neutral hydrogen atoms formed during recombination in the early universe (108 to 109 years after the Big Bang). Frequently attributive Compare "recombination".

Origin

Early 20th century. From re- + ionization.

Pronunciation

reionization

/riːˌʌɪənʌɪˈzeɪʃn/