The definition of a treat is something pleasant that is unexpected or that is offered as a surprise or a reward.(noun)
An example of a treat is going out for ice cream.
To treat is to act a certain way towards a person or thing or to provide medical aid or help.(verb)
See treat in Webster's New World College Dictionary
Origin: ME treten < OFr traiter, to handle, meddle, treat < L tractare, freq. of trahere, to draw
See treat in American Heritage Dictionary 4
verb treat·ed, treat·ing, treats verb, transitive
Origin: Middle English tretien
Origin: , from Old French traitier
Origin: , from Latin tractāre
Origin: , frequentative of trahere, to draw.
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