leaven

noun

leav·en | \ ˈle-vən

Definition of leaven

(Entry 1 of 2)

1a : a substance (such as yeast) used to produce fermentation in dough or a liquid especially : sourdough

b : a material (such as baking powder) used to produce a gas that lightens dough or batter

2 : something that modifies or lightens

leaven

verb

leavened; leavening\ ˈlev-niŋ

, ˈle-və- \

Definition of leaven (Entry 2 of 2)

1 : to raise something, such as bread) with a leaven

2 : to mingle or permeate with some modifying, alleviating, or vivifying element especially : lighten a sermon leavened with humor