## Meanings
1. A substance, such as yeast, added to dough to make it rise.
2. To add a substance that makes dough rise.
3. An influence that subtly lightens or improves something.
4. To soften or brighten something serious with a lighter element.

## Examples
- Bakers add leaven so the bread will rise as it bakes.
- Yeast is used to leaven bread during baking.
- The serious report benefited from a leaven of humour.
- The comedian's jokes helped leaven the tense atmosphere.

## Derived Forms
- leavened
- leavener
- leavening
- leavenless
- leavenous
- overleaven
- unleavenable
- unleavened

## Related Forms
- yeast

## Roots and Affixes
- Root: levayn
- Root: levain
- Root: *levāmen
- Root: levō

## Etymology
From Middle English levayn, borrowed from Old French levain, from Vulgar Latin *levāmen, a noun based on Latin levō (“raise”).

## AI Etymology
Leaven is from Middle English levayn, borrowed from Old French levain, from Vulgar Latin *levāmen, a noun based on Latin levō (“raise”). Important recorded forms include levayn (Middle English), levain (Old French), *levāmen (la-vul), and levō (Latin). Current senses include a substance, such as yeast, added to dough to make it rise, to add a substance that makes dough rise, and an influence that subtly lightens or improves something. The wider family includes derived forms such as leavened, leavener, leavening, leavenless, and leavenous and related words such as yeast.

## Topics
- Science & Research
- Word Formation & Derivatives

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