A public notice or announcement, typically paid for, designed to promote a product, service, or idea to potential customers.
From advertise (from Old French advertir, meaning 'to turn toward') plus the suffix -ment indicating an action or result. The spelling with 'z' reflects a variant used historically, especially in American English before standardization.
This older spelling 'advertizement' shows how English spelling was fluid until Webster's dictionary helped standardize it—today we'd write 'advertisement,' but this 18th-century form reminds us that spelling wasn't always a fixed rule.
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