lexicologyPronunciation: /ˌlɛksɪˈkɒlədʒi/Definition of lexicology noun [mass noun] the study of the form, meaning, and behaviour of words. Derivatives lexicologicalPronunciation: /-kəˈlɒdʒɪk(ə)l/ adjective lexicologicallyPronunciation: /-kəˈlɒdʒɪk(ə)li/ adverb lexicology in other Oxford dictionaries Definition of lexicology in the US English dictionary