IPA: /ˈɑːrkeɪɪzəm/
KK: /ˈɑrkeɪɪzəm/
A word, phrase, or style that is old-fashioned and no longer in common use.
The poem was filled with archaisms that made it difficult to understand.
Archaism is formed from "archaios" (meaning ancient) and the suffix "-ism" (denoting a practice or belief). The word refers to the practice of using or imitating ancient styles or forms, often in language or art.
Think of 'ancient' ('archaios') to remember that 'archaism' refers to the practice of using old or ancient styles.