A written abbreviation for 'additional,' meaning extra or more than what was originally stated.
Abbreviated form of 'additional,' from Middle English via Old French 'addicion,' used extensively in modern business writing and forms to denote supplementary information.
You'll see 'addnl' on forms, contracts, and labels everywhere—it's a abbreviation so common that many people don't realize it's shortened, showing how language adapts when space matters more than formality.
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