noun
lifework; life's work
Refers to the central, long-term pursuit or mission of one's life, often used for artistic, academic, or professional dedication.
彼にとってこの研究はライフワークだ。
For him, this research is his lifework.
環境保護が彼女のライフワークになった。
Environmental protection became her life's work.
Borrowed from English 'lifework', combining 'life' and 'work'. The term entered Japanese as a katakana loanword, retaining its original meaning.