noun
memorial service; memorial ceremony
A formal gathering to honor and remember the deceased, often held on an anniversary or after a funeral.
来月、故人の追悼式が営まれる予定です。
A memorial service for the deceased is scheduled to be held next month.
Compound of 追悼 (ついとう, 'mourning, tribute') and 式 (しき, 'ceremony'). 追悼 is from 追 (つい, 'to follow, to pursue') and 悼 (とう, 'to grieve, to lament').