An archaic or legal term for a debtor; a person or entity that owes money or is obligated to pay.
From Latin 'debitor,' an agent noun from 'debere' (to owe). This is the direct Latin form, sometimes used in legal Latin phrases or archaic English texts.
In medieval English courts, you'd see 'debitor' in Latin legal documents, and the distinction between 'debitor' and 'debtor' shows how English absorbed Latin vocabulary in layers rather than all at once!
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