Evangelicalism is one of the largest and most dynamic forms of Christianity in the modern world, but there is an amorphous quality to many words that end with the suffix “-ism,” and “evangelicalism” is no exception. “Evangelicalism” does not have the hard and crisp denotation of a concrete noun such as “Jesuit.” This confusion goes back to lexical roots. The English language uses the Anglo-Saxon noun “gospel” for the Greek “evangel” but retains the Greek root for the adjective “evangelical” and the abstract class-noun “evangelicalism.” There was a time when certain Protestants were called Gospellers, but the obvious link between “gospel” and “evangelical” has now been largely obscured. As an abstract noun naming things that cannot be heard, seen, or touched, “evangelicalism” seems always in need of more concrete definition.