1. any member of the kingdom Animalia, comprising multicellular organisms that have a well-defined shape and usually limited growth, can move voluntarily, actively acquire food and digest it internally, and have sensory and nervous systems that allow them to respond rapidly to stimuli: some classification schemes also include protozoa and certain other single-celled eukaryotes that have motility and animallike nutritional modes.
2. any such living thing other than a human being.
3. a mammal, as opposed to a fish, bird, etc.
4. the physical, sensual, or carnal nature of human beings; animality: the animal in every person.
5. an inhuman person; brutish or beastlike person.