Wikipedia says, "A consultant is a professional who provides professional or expert advice in a particular area such as management, accountancy, the environment, entertainment, technology, law (tax law, in particular), human resources, marketing, emergency management, food production, medicine, finance, life management, economics, public affairs, communication, engineering, sound system design, graphic design, or waste management."
Or in the case of a consultant wife, all of the above.
Said with the utmost respect for my own consultant wife and life partner.