一周忌
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Meanings
1
first anniversary of a person's death
Refers specifically to the Buddhist memorial service held on the first anniversary of a death, counting from the date of death. Often used in the context of 一周忌の法要.
See also: 忌日 (きにち)
Relatives gathered for the first anniversary of my grandmother's death.
Next month is the first anniversary of my father's death, so I'm preparing for the memorial service.