noun
a combination of the number 4 and the letter E, typically used as an abbreviation or code
adjective
describing something related to or associated with the combination of the number 4 and the letter E
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The 4E framework is commonly used in business strategy analysis.
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I have to study the 4E model for my marketing class.
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I'm so over the 4E stuff, it's too complicated.
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In order to succeed, you need to have all 4E's in place: efficiency, effectiveness, economy, and ethics.