a word or phrase, often sounding authoritative or technical, that is a vogue term in a particular profession, field of study, popular culture, etc.

1965–70; buzz1 + word Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1946, from buzz + word. Noted as student slang for the key words in a lecture or reading.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But cloud services vary between companies so much that the buzzword can get
  awfully confusing.
It's the buzzword, to be sure, in book publishing and other media in this era
  of conglomeration and consolidation.
Translational medicine is indeed a big buzzword these days.
Ecotourism is a buzzword that has recently been gaining momentum both
  nationally and internationally.
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