The definition of a pet is a companion animal that you take care of and that keeps you company, like a dog or a cat.(noun)
An example of pet is your dog.
To pet is to rub, pat or touch something or someone with affection.(verb)
An example of pet is when you run your hands through your dog's fur.
See pet in Webster's New World College Dictionary
Origin: orig. Scot dial., prob. back-form. < ME pety, small: see petty
See pet in American Heritage Dictionary 4
Origin: Scottish Gaelic peata, tame animal, pet
Origin: , from Old Irish.
Origin: Origin unknown.
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