The act of providing assurance or promise that something will happen or that a condition will be met; offering security or warranty.
From Old French 'garantir' meaning 'to protect, defend,' ultimately from Germanic 'warand' (protecting). The commercial sense of providing security for agreements developed in medieval trade, evolving into modern warranty concepts.
Guaranteeing something is essentially making a promise backed by consequences - it's putting your reputation or resources on the line for someone else's confidence. In our uncertain world, guarantees have become so valuable that entire industries exist just to provide them, from insurance to warranties.
Complete word intelligence in one call. Free tier — 50 lookups/day.