American spelling of the present participle; the act of making something deliberately old-fashioned or imitating ancient styles.
The present participle of 'archaize' (American spelling), formed by adding '-ing.' American English prefers '-izing' while British English uses '-ising.'
The difference between 'archaising' and 'archaizing' is itself a linguistic archaism—these spelling differences froze in place centuries ago when American and British English diverged!
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