The dictionary contains some 3,400 terms as headwords, ranging from the legal and ecclesiastic to the more prosaic words of daily life. Latin was the language of the church, law and government, and many Latin terms illustrated here are frequently found in modern books of history of the period; similarly, the precise meaning of Old English and Middle English terms may elude today's reader: this dictionary endeavours to provide clarity. In addition to definition, etymologies of many words are given, in the belief that knowing the origin and evolution of a word gives a better understanding. There are also examples of medieval terms and phrases still in use today, a further aid to clarifying meaning.