Learn how to say Leavener correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word leaven:
1a substance, typically yeast, that is added to dough to make it ferment and rise.
dough that is reserved from an earlier batch in order to start a later one fermenting.
2a pervasive influence that modifies something or transforms it for the better:
they acted as an intellectual leaven to the warriors who dominated the city
1 (usually as adjective leavened) cause (dough or bread) to ferment and rise by adding leaven:
leavened breads are forbidden during Passover
2permeate and modify or transform (something) for the better:
the proceedings should be leavened by humour
(as noun leavening)
companies of Territorial Army volunteers with a leavening of regular soldiers
Middle English: from Old French levain, based on Latin levamen ‘relief’ (literally ‘means of raising’), from levare ‘to lift’