One who accerses or summons; an officer or official who issues a summons or legal challenge in Scottish law.
From accerse with the agent suffix -itor (Latin -itor meaning 'one who'). This is a specialized legal title from Scottish jurisprudence.
Every medieval legal system needed people to deliver summons, so Scottish law created this title for the official whose job was to go find someone and formally tell them they were being sued—the accersitor was like a legal messenger!
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