Added 9 October 2026 lifelong /ˈlaɪf.lɔːŋ/ adjective Categories: Describing WordsUncommon Words adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about lifelong at Wordnik → Where our words come from → Extending for the entire duration of life. They were lifelong friends; they met in elementary school and ended their lives in the same rest home. Related Words: longwomb-to-tomblifetimesustainedperennialcontinuingongoingcontinuedcontinualpermanentlyperpetualsteady Back to today's word