Nomenclature is a system for naming things and putting things into categories. It is used in science, especially biology.
My science teacher asked me: "How is your Felis catus today?" I had no idea she was using scientificnomenclature to ask me how my cat is.
The teacher explained that there are thousands of words for "cat" in different languages. However, if you said "Felis catus" to any scientist in the world, they would know you were talking about a cat.
