Dictionary Definition :
Definition[1]
:
The seventh seventh day of the masses for the dead.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
:
(行事)中陰四十九日也。人死亡後,每七日營齋,修佛事而追薦之,是云齋七。其第七追薦日稱為七七忌。
Source
:
丁福保《佛學大辭典》