The primary accent of the word advertisement is in the second syllable or adVERtisement.
All words that include more than one syllable have one specific syllable that is stressed or pronounce with a greater emphasis. This syllable is the primary accent of the word.
The stress or emphasis in this word in the syllable ver or adVERtisement, which is the most common pronunciation in American English.
However, it is possible to emphasize the first syllable or ADvertisement, which is considered the second pronunciation. This pronunciation is more common in British English.
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