archaism
noun
ar·cha·ism
ˈär-kē-ˌi-zəm
-(ˌ)kā-ˌi-
1
: the use of archaic diction or style
2
: an instance of archaic usage
3
: something archaic
especially
: something (such as a practice or custom) that is outmoded or old-fashioned
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Merriam-Webster unabridged
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