noun. In chem., the production of isomeric forms of a given substance or class of substances.

noun. the conversion of a compound into a different isomeric form

noun. the conversion of a compound into an isomer of itself

"Among other applications, tungstated zirconia is used to improve the octane content of gasoline through a process called isomerization, in which a straight chain alkane molecule is converted into a branched chain molecule."