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2006, The Mishnah, seder Zeraim, tractate Challah, Personal-Size edition, Mesorah Publications, page 54, commentary on 1:7:
[…]it is a time-honored custom that when women bake challah-loaves for Sabbath and Yom Tov use, they specifically prepare a dough large enough to be obligated in challah, so they can fulfill the mitzvah of separating challah[…].
(uncountable) The commandment to separate a portion of bread or bread dough for the cohanim (Numbers 15:17–21); in contemporary practice, the portion is burned until inedible.
(countable) The portion separated in fulfillment of the above.
separating challah on Wikipedia.Wikipedia 
Cookbook:challah on Wikibooks.Wikibooks 
