Pronunciation Audio (US)(file) Noun Singular kit Plural kits (countable) A kit is a collection of tools. Bill has a kit to fix toy cars. (countable) A young cat (short for kitten) (countable) A young of several (usually small carnivore) species: beaver, ferret, fox, mink, rabbit, raccoon, squirrel,wolverine (countable) A flock of pigeons, flying togetherWikiwand - on Seamless Wikipedia browsing. On steroids.