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1. A word or phrase that has gained recent popularity, especially among a particular group of people or within a specific context. "Synergy" is a buzz word used to describe the concept of multiple organizations working together towards a common goal.
2. A popular word or phrase that is used so often that it loses its impact or meaning. The boss used so many corporate buzz words in our morning meeting that I'm not even sure I understand what he was trying to say. Harry lost his audience's attention when he started using buzz words during his presentation, which began to seem dull and unoriginal.