Homologation is a technical term, derived from the Greek homologeo (ὁμολογέω) for "agree", which is generally used in English to signify the granting of approval by an official authority. This may be a court of law, a government department, or an academic or professional body, any of which would normally work from a set of strict rules or standards to determine whether such approval should be given. The word may be considered very roughly synonymous with accreditation and, in fact, in French may be used with regard to academic degrees. Certified is another possible synonym, while to homologate is the infinitive form.
Today, the word is used within the European Union in those papers that are direct translations from French to refer to the processes of making trade standards and laws consistent throughout the whole of the union. British journalists usually prefer to use the term harmonisation for this purpose.
A court action may sometimes be homologated by a judicial authority before it can proceed, and the term has a precise legal meaning in the legal codes of some countries.
Another usage pertains to the biological sciences, where it may describe the similarities used to assign organisms to the same family or taxon, similarities they have jointly inherited from a common ancestor.
Perhaps the closest this word comes to everyday usage is in reference to high performance race cars. Many motorsports fans know that a vehicle must be homologated by the sanctioning body in order to race in a given class, such as NASCAR or Formula One. The branding of the classic Ferrari 250 GTO and its namesake the Pontiac GTO carried this sense of the word, as the initials stood for "Gran Turismo Omologato" which was Italian for "Grand Touring, Homologated."
In today's marketplace products, UN Specification Packaging must be homologated by a public agency to assure that it meets the UN Standard for such things as safety and environmental impact.