Lifelong/ˈlaɪflɔːŋ/ Definition 1 of 3Pro Tip 1/3Personal significance Emphasizes the importance or influence on someone's life, suggesting a deep connection. Her lifelong love of music shaped her career. Pro Tip 2/3Not just lengthy Conveys that 'lifelong' is an emotional, not just chronological, measure of time. A lifelong journey of self-improvement can be fulfilling. Pro Tip 3/3Emotional investment Indicates a choice with significant emotional dedication, beyond a casual interest. Becoming a lifelong advocate for justice was his calling.