Definition of onomastics
1a
: the science or study of the origins and forms of words especially as used in a specialized field
b
: the science or study of the origin and forms of proper names of persons or places
2
: the system underlying the formation and use of words especially for proper names or of words used in a specialized field
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Merriam-Webster unabridged
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Time Traveler for onomastics
The first known use of onomastics was in 1904
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