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 animal like nutrition modes.
2. any such living thing other than a human being.
We are animals; we just happen to be the most intelligent animals on Earth.
Genetic (DNA) evidence strongly supports this.
The human chromosome number 2 is a fusion of two ape chromosomes,
so yes, without a shadow of a doubt... We are apes.