1
: lasting or continuing through life
a lifelong friendship
2
Examples of lifelong in a Sentence
He had a lifelong love of nature.
Recent Examples on the Web
Comparable in size to the Arc de Triomphe, the Porte Monumentale also contained surface ornamentation based on Haeckel’s exacting lifelong documentation of organisms to be found in the world’s oceans.
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Literary Hub, 28 Oct. 2025
The organizations say the policy is meant to keep facilities focused on lifelong care rather than creating new animals for display.
—Quinn Clark, jsonline.com, 27 Oct. 2025
Boundaries, compassion and emotional clarity are your lifelong teachers.
—Valerie Mesa, PEOPLE, 27 Oct. 2025
Her father’s activism as a founding member of the Screen Actors Guild in the 1930s also shaped her lifelong belief in fair working conditions.
—Stephanie Giang-Paunon, FOXNews.com, 25 Oct. 2025
See All Example Sentences for lifelong
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Literary Hub, 28 Oct. 2025
The organizations say the policy is meant to keep facilities focused on lifelong care rather than creating new animals for display.
—Quinn Clark, jsonline.com, 27 Oct. 2025
Boundaries, compassion and emotional clarity are your lifelong teachers.
—Valerie Mesa, PEOPLE, 27 Oct. 2025
Her father’s activism as a founding member of the Screen Actors Guild in the 1930s also shaped her lifelong belief in fair working conditions.
—Stephanie Giang-Paunon, FOXNews.com, 25 Oct. 2025
See All Example Sentences for lifelong
Cite this Entry
“Lifelong.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lifelong. Accessed 5 Nov. 2025.
Copy CitationKids Definition
lifelong
adjective
life·long
ˈlī-ˌflȯŋ 
: continuing or lasting through life
a lifelong love for trees
a lifelong friendship
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