(biology) The act or process of mating organisms of different varieties or species to create a hybrid.
(molecular biology) The process of forming a double stranded nucleic acid from joining two complementary strands of DNA (or RNA).
(chemistry) The mixing of atomic orbitals to form new orbitals suitable for bonding.
In biology, hybridization (or hybridisation) is usually used as a term in agriculture or in plant production where new hardy and disease-resistant crops are formed.
Related terms: hybrid (noun), hybridize or hybridise (verb).