Question: This multi-event motor racing championship held across Europe and the origin of the term that describes it lies in the nomenclature that was adopted by the FIA for all of its post-World War II single-seater what?
Sentence (from "Formula racing"): The origin of the term lies in the nomenclature that was adopted by the FIA for all of its post-World War II single-seater regulations, or formulae.
Relevant evidence: Yes