Relating to or containing a promise to pay, most commonly used in 'promissory note' - a written promise to pay a specified amount of money to a designated party at a future date or on demand.
From Latin promissorius, from promittere meaning 'to send forth' or 'promise'. The legal concept of promissory obligations dates back to Roman law, with promissory notes becoming common in medieval European commerce.
A promissory note is like an IOU on steroids - it's legally enforceable and can be bought, sold, or used as collateral, turning a simple promise to pay into a tradeable financial instrument!
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