Definition from Wiktionary, the free dictionary
cautioner (plural cautioners)
- A person who cautions.
- (Scotland) A surety.
1693, James Dalrymple Stair, The institutions of the law of Scotland, page 755:
- Fourteen Days are only allowed for Sists of Execution, from the Date the Bill was signed, for the Clerks inquiring in the Condition of the Cautioner […]