Yahrzeit Pages

Yahrtzeit, יאָרצײַט, means "Time (of) Year" in Yiddish. Alternative spellings include yortsayt (using the YIVO standard Yiddish orthography), Yohr Tzeit, yahrzeit, yartzeit, and jahrzeit. The word is also used by non-Yiddish-speaking Ashkenazi Jews, and refers to the anniversary of the day of death of a relative. Yahrtzeit literally means "time of [one] year".
From the Wikipedia page Bereavement in Judaism