Definition of onomastics noun from the Oxford Advanced Learner's Dictionary

 

onomastics

 noun
noun
BrE BrE//ˌɒnəˈmæstɪks//
 
; NAmE NAmE//ˌɑːnəˈmæstɪks//
 
[uncountable]
 
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the study of the history and origin of names, especially names of people
See the Oxford Advanced American Dictionary entry: onomastics