The Collaborative International Dictionary
Confarreation \Con*far`re*a"tion\, n. [L. confarreatio, fr. confarreare to marry; con- + farreum (sc. libum cake) a spelt cake, fr. farreus made of spelt, fr. far a sort of grain.] (Antiq.) A form of marriage among the Romans, in which an offering of bread was made, in presence of the high priest and at least ten witnesses.
Douglas Harper's Etymology Dictionary
c.1600, from Latin confarreationem, from confarreare "to unite in marriage by the Ceremony of the Cake," from com- "with, together" (see com-) + far, farris "spelt, grain, meal" (see barley). In ancient Rome, the most solemn form of marriage, in which an offering of bread was made in the presence of the Pontifex Maximus and 10 witnesses.
Wiktionary
n. A form of marriage in Ancient Rome that was solemnized with cakes made from far (spelt)