Dictionary Definition :
Definition[1]
:
To enter into extinction (nirvana) 涅槃. (1) The goal of the path of the practices of the two vehicles 二乘, wherein, at the final stage, body and mind are erased without a trace. (2) The death of an eminent monk--same as 入滅
Definition[2]
:
To inter into rest, or nirvāṇa; also, to die. Also 入滅 or 入寂滅.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[3]
:
入寂===(術語)入寂滅也。梵語涅槃,一譯寂滅。離煩惱云寂,絕生死之苦果曰滅。故證果人之死,名為入寂。
Source
:
丁福保《佛學大辭典》