A person who has been harmed or injured, especially in legal contexts; one who has suffered damage or loss.
From Latin damnificatus, past participle of damnificare (to cause loss or damage), combining damnum (loss, damage) and facere (to make or do). The term evolved through medieval Latin legal language into English.
This word is practically extinct in modern English, but it's the ancestor of our modern legal term 'damaged party' — lawyers used to call injured people 'damnificati' in formal documents, showing how Latin shaped the entire vocabulary of justice systems.
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