noun
a long word or characterized by long words; long-windedness
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His writing style is characterized by sesquipedalianism, with long and complex words used frequently.
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She always uses big words in her essays, it's like she's trying to show off her sesquipedalianism.
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I can't stand people who use sesquipedalianism in everyday conversation, just speak normally!
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The company's marketing strategy was a sesquipedalianism of jargon and buzzwords, making it hard for customers to understand.