backgrounder
noun
back·ground·er
ˈbak-ˌ(g)rau̇n-dər
1
: an off-the-record briefing for reporters
2
: something (such as an essay) that provides background information about a particular subject
She believes birds are the best model for understanding human language. But before making her argument, she offers a highly informative backgrounder on bird song.—K. C. Cole
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Merriam-Webster unabridged
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