Thanks is defined as a shorter way of saying thank you, which is defined as what someone says when they appreciate something someone has done for them.
(interjection)An example of thanks is what you'd say to someone who's opened the door for you.
See thanks in Webster's New World College Dictionary
plural noun
Origin: pl. of ME thank < OE thanc, thanks: see thank
interjection
See thanks in American Heritage Dictionary 4
plural noun
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