## Meanings
1. To promise that something will happen or be done.
2. A firm promise that something will happen or is true.
3. A written promise that a product will work or be repaired for free for a set time.
4. To make something certain to happen.

## Examples
- I can't guarantee that we'll arrive on time.
- There is no guarantee that the weather will be good.
- The laptop comes with a two-year guarantee.
- Hard work does not always guarantee success.

## Synonyms
- assure
- vouch
- warrant
- warranty

## Derived Forms
- guaranteeable
- guaranteer
- nonguarantee
- overguarantee
- reguarantee

## Related Forms
- guarantor
- guaranty

## Roots and Affixes
- Root: guarantie
- Root: garante
- Root: *warjand

## Etymology
From Old French guarantie (perhaps via a later Spanish garante), from the verb guarantir (“to protect, assure, vouch for”), ultimately from Old Frankish *warjand, *warand (“a warrant”), or from guaranty. Doublet of guaranty and warranty.

## AI Etymology
Guarantee comes from Old French guarantie (perhaps via a later Spanish garante), from the verb guarantir (“to protect, assure, vouch for”), ultimately from Old Frankish *warjand, *warand (“a warrant”), or from guaranty. Doublet of guaranty and warranty. In current use, the main senses are “To promise that something will happen or be done” and “A firm promise that something will happen or is true”.

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