A person who shortens words or texts, or a tool or device that makes abbreviations.
From 'abbreviate' + '-or' (Latin agent suffix meaning 'one who'). Medieval scribes were sometimes called abbreviators because shorthand-writing was a valuable skill.
In the Middle Ages, 'abbreviators' were actually prestigious scribes in the papal court who created official shortened versions of documents—abbreviating was a high skill, not just lazy texting.
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