一生
N3いっしょう
[isshou]
Meanings
1.NounNo-adjAdverb
whole life; a lifetime; all through life; one existence; a generation; an age; the whole world; the era
2.No-adj
(the only, the greatest, etc.) of one's life
Examples
この旅行は一生忘れられない思い出になる。
This will become a lifetime memory.
祖父から譲り受けた懐中時計は、彼にとって一生の宝物として今も大切に手入れされている。
The pocket watch he had inherited from his grandfather was for him a treasure of a lifetime, and he still cared for it lovingly to this day.
目標達成のため一生懸命に努力してきた。
I have worked hard with all my might.