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8 Words That Are Older Than You Think

nighty-night

[nahy-tee-nahyt] /ˈnaɪ tiˈnaɪt/
interjection, Informal.
Origin
1875-1880
1875-80; reduplication of (good) night; see -y2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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