1A substance used in dough to make it rise, such as yeast or baking powder.‘during the 18th century yeast was abandoned as a leavening for fruit cakes’
- ‘everything will be made with natural leavening and wholegrain flour’
2A quality or element that permeates and modifies or transforms something for the better.
- ‘underneath the frills and fuss there's a leavening of serious intent’
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