Animals meaning : In scientific usage, a multicellular organism that is usually mobile, whose cells are not encased in a rigid cell wall (distinguishing it from plants and fungi) and which derives energy solely from the consumption of other organisms (distinguishing it from plants). In non-scientific usage, any member of the kingdom Animalia other than a human. In non-scientific usage, any land-living vertebrate (i.e. not fishes, insects, etc.). A person who behaves wildly; a bestial, brutal, brutish, cruel, or inhuman person. A person of a particular type. Matter, thing.