Noun leaven has 2 senses
  1. leaven, leavening - a substance used to produce fermentation in dough or a liquid
    --1 is a kind of substance, matter
    --1 has particulars: baking powder; sourdough; yeast, barm
    Derived form: verb leaven1
  2. leaven, leavening - an influence that works subtly to lighten or modify something; "his sermons benefited from a leavening of humor"
    --2 is a kind of imponderable
,Verb leaven has 1 sense
  1. raise, leaven, prove - cause to puff up with a leaven; "unleavened bread"
    --1 is one way to raise, lift, elevate, get up, bring up
    Derived form: noun leaven1
    Sample sentence:
    They leaven more bread
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