mid-14c., "slight refreshment," originally taken in the afternoon, from none "noon" (see noon) + shench "draught, cup," from Old English scenc, related to scencan "to pour out, to give to drink," cognate with Old Frisian skenka "to give to drink, German, Dutch schenken "to give." Cf. luncheon.

Online Etymology Dictionary, © 2010 Douglas Harper

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Historical Examples of nuncheon