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
Janine Henni, Peoplemag, 22 May 2024
What most considered an adventure of a lifetime was just another month for Bolan, who made friends wherever her worldwide trips took her.
—Ishani Desai, Sacramento Bee, 22 May 2024
See all Example Sentences for lifetime 
Noun
During the conversation, moderated by PEOPLE’s Senior Royals Editor Erin Hill, Emanuel said the assignment of a lifetime was Diana’s 1981 wedding day.
—Janine Henni, Peoplemag, 22 May 2024
What most considered an adventure of a lifetime was just another month for Bolan, who made friends wherever her worldwide trips took her.
—Ishani Desai, Sacramento Bee, 22 May 2024
See all Example Sentences for lifetime
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'lifetime.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near lifetime
Cite this Entry
“Lifetime.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lifetime. Accessed 31 May. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share