1
a
: the duration of the existence of a living being (such as a person or an animal) or a thing (such as a star or a subatomic particle)
b
2
: an amount accumulated or experienced in a lifetime
a lifetime of regrets
1
: lifelong
2
: of long duration or continuance
lifetime legislation
3
: measured or achieved over the span of a career
a baseball player's lifetime batting average
Synonyms
Examples of lifetime in a Sentence
Noun
a lifetime spent traveling the world
It would have taken me a lifetime to read all those books.
Childhood seems a lifetime ago now!
a chemical with a lifetime of only a few minutes
the lifetime of a planet
Recent Examples on the Web
Matthew Futterman, The Athletic, 12 Jan. 2025
In addition to two season tickets until 2055, the lucky winner gets a softball game for 30 at PNC Park and a spring training experience of a lifetime that includes batting practice with the team.
—Tj MacIas, Fort Worth Star-Telegram, 10 Jan. 2025
Stephan Rabimov, Forbes, 24 May 2021
In addition to keynote speeches, panel discussions, workshops and networking, the 2019 Music Biz conference will again take time to recognize both recent and lifetime achievements.
—Gary Graff, Billboard, 29 Apr. 2019
See all Example Sentences for lifetime 
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Noun
As Sabalenka found out in 2022, razing a service motion built up through a lifetime of repetitions is one of the most vulnerable things a tennis player can do.
—Matthew Futterman, The Athletic, 12 Jan. 2025
In addition to two season tickets until 2055, the lucky winner gets a softball game for 30 at PNC Park and a spring training experience of a lifetime that includes batting practice with the team.
—Tj MacIas, Fort Worth Star-Telegram, 10 Jan. 2025
Adjective
Getting an Emmy award is a lifetime dream for many.
—Stephan Rabimov, Forbes, 24 May 2021
In addition to keynote speeches, panel discussions, workshops and networking, the 2019 Music Biz conference will again take time to recognize both recent and lifetime achievements.
—Gary Graff, Billboard, 29 Apr. 2019
See all Example Sentences for lifetime
Dictionary Entries Near lifetime
Cite this Entry
“Lifetime.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lifetime. Accessed 18 Jan. 2025.
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