A more thorough explanation:

Definition: An abbreviator is someone who shortens or abridges something. In the context of Ecclesiastical law, an abbreviator is an officer in the court of Rome who assists the vice-chancellor in drafting the Pope's briefs and converting petitions into papal bulls.

• A journalist who writes a summary of a long article is an abbreviator.
• A student who uses acronyms to remember a list of items is also an abbreviator.
• In the court of Rome, an abbreviator would help the vice-chancellor in drafting the Pope's briefs and converting petitions into papal bulls.

The examples illustrate how an abbreviator can shorten or abridge something to make it more concise and easier to understand. In the context of Ecclesiastical law, an abbreviator's role is to assist in the drafting of important documents for the Pope.