the anniversary of the death of a parent, sibling, child, or spouse, observed by lighting a memorial lamp or candle the night before and reciting the Kaddish at the evening service of the day before and at the morning and afternoon services of the day itself.
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British Dictionary definitions for Yahrzeit
Judaism the anniversary of the death of a close relative, on which it is customary to kindle a light and recite the Kaddish and also, in some communities, to observe a fast
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012