a small portion of food or drink or a light meal, especially one eaten between regular meals.
a share or portion.
Australian Slang. something easily done.
verb (used without object)
to have a snack or light meal, especially between regular meals: They snacked on tea and cake.
go snack/snacks, to share (profits or returns).

1300–50; (noun) Middle English: a snap or bite, derivative of snacken to snap, bite; compare Middle Dutch snack a snap; (v.) derivative of the noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
snack (snæk)
1.  a light quick meal eaten between or in place of main meals
2.  a sip or bite
3.  rare a share
4.  informal (Austral) a very easy task
5.  (intr) to eat a snack
[C15: probably from Middle Dutch snacken, variant of snappen to snap]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "to bite or snap" (of a dog), probably from M.Du. snacken "to snatch, chatter" (see snatch). The meaning "have a mere bite or morsel, eat a light meal" is first attested 1807; the noun in this sense is from 1757. Snack bar is attested from 1930.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No dishes to clean as every meal and snack will be provided.
Regularly scheduled meal and snack times help your preschooler learn structure
  for eating.
Not too heavy, not too light-perfect for a light lunch or snack with tea.
Freeze blueberries on a cookie sheet and store them in freezer bags so you can
  snack on them all year.
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