Part of speech: verb

To make light by fermentation.

Part of speech: noun

A fermenting substance; ferment; influence causing change.

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Usage examples "leaven":

  1. The leaven of Christian morality was present in the lump of traditional social conditions; but it had not yet begun to work extensively. - "Women of Early Christianity Woman: In all ages and in all countries, Vol. 3 (of 10)", Alfred Brittain Mitchell Carroll.
  2. Here, however, within the bodies of animals and vegetables we find equivocal generation a necessity; nor do I see any way out of it except by maintaining that nothing is ever either quite dead or quite alive, but that a little leaven of the one is always left in the other. - "The Note-Books of Samuel Butler", Samuel Butler.
  3. The religion of Christ is a leaven of action, understanding, sacrifice, and charity. - "Saint Augustin", Louis Bertrand.