noun
Refers to the entire span of a person's life or their life's work; often used in formal or reflective contexts.
彼は生涯を教育に捧げた。
He devoted his life to education.
生涯の友
There are few people you can call a lifelong friend.
noun, adverb
for life; all one's life; throughout one's life
Adverbial use meaning 'for the rest of one's life' or 'throughout one's entire life'; often used with verbs like 忘れない, 続ける, 覚えている.
この恩は生涯忘れません。
I will never forget this kindness for the rest of my life.
彼は生涯独身を通した。
He remained single all his life.