noun

• A reversion to an earlier stage of development.
• (derogatory) A person considered to be primitive, uncivilized and mentally deficient.
• An organism that has characteristics of a more primitive form.
• An atavism.
• A person similar to an ancestor, or something new similar to what already existed.
• (slang, often attributive) A person or thing that evokes memories.
• (US, accounting) A practice to avoid untaxed nowhere income by instead taxing such income in the originating state for a given transaction.