We found one dictionary that defines the word overadvertisement:

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1. overadvertisement: Wiktionary

Definitions from Wiktionary (overadvertisement) ▸ noun:  Excessive advertising. ▸ Words similar to overadvertisement ▸ Usage examples for overadvertisement ▸ Idioms related to overadvertisement ▸ Wikipedia articles (New!) ▸ Popular adjectives describing overadvertisement ▸ Words that often appear near overadvertisement ▸ Rhymes of overadvertisement ▸ Invented words related to overadvertisement