A medieval legal term combining 'fiat' (let it be done) with 'confirmatio' (confirmation); a royal decree confirming or validating previous grants or legal arrangements.
Combination of Latin 'fiat' (third-person singular of 'facere,' to do) and 'confirmatio' (from 'confirmare,' to make firm), used in medieval English and Norman-French legal documents.
Medieval lawyers basically invented legal jargon by mashing Latin words together, and fiatconfirmatio was the royal stamp of approval—the king saying 'I officially confirm this deal is legit.' It's where we get the idea of 'royal confirmation.'
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