Noun
halogenation (countable and uncountable, plural halogenations)
(chemistry) The reaction of a halogen with something, especially the replacement of a hydrogen atom of an organic compound with a halogen one.
However, electrophilic substitution is relatively facile at the 5-position, including nitration and halogenation. Source: Internet
Experiments have shown that all halogenation produces a mixture of all possible isomers, indicating that all hydrogen atoms are susceptible to reaction. Source: Internet