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

 

archaism

 noun
noun
BrE BrE//ˈɑːkeɪɪzəm//
 
; NAmE NAmE//ˈɑːrkeɪɪzəm//
 
(specialist) Linguistic devices
 
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a very old word or phrase that is no longer used See related entries: Linguistic devices Word Origin mid 17th cent.: from modern Latin archaismus, from Greek arkhaismos, from arkhaizein ‘imitate archaic styles’, from arkhaios ‘ancient’, from arkhē ‘beginning’.
See the Oxford Advanced American Dictionary entry: archaism