onomastic UK /ˌɒ.nəʊˈmæs.tɪk/US /ˌɑː.noʊˈmæs.tɪk/ adjective2 •Of or relating to a personal or place name.The core of the study consists of an onomastic analysis and comparison of some selected areas of the urbanonymic system; I also delineate the characteristics of different urbanonymic types. — 2013 •Of or relating to onomastics.