lifetime

noun
life·​time | \ ˈlīf-ˌtīm \

Definition of lifetime

 (Entry 1 of 2)

1a : 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)
2 : an amount accumulated or experienced in a lifetime a lifetime of regrets

lifetime

adjective

Definition of lifetime (Entry 2 of 2)

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

Keep scrolling for more

Synonyms for lifetime

Synonyms: Noun

continuance, date, duration, life, life span, run, standing, time

Visit the Thesaurus for More 

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
See More

Recent Examples on the Web: Noun

During his lifetime, spent almost entirely in captivity, Sudan's subspecies went extinct in the wild because of habitat degradation and poaching. Ernie Mastroianni, Discover Magazine, "Discover's Images of the Year 2018," 20 Dec. 2018 At current rates of warming, the world will likely cross the 1.5 degree threshold between 2030 and 2052, well within the lifetime of most adults and children alive today. Nadja Popovich, The Seattle Times, "Why half a degree of global warming is a big deal," 9 Oct. 2018 Her 2005 split from now-ex-husband Brad Pitt inspired a veritable lifetime of demeaning and belittling headlines that constantly paint her as the heartbroken victim in a classic love triangle (with Pitt and Angelina Jolie). Kathryn Lindsay, refinery29.com, "Why Be Engaged When You Can Be An Ex?," 13 July 2018 Still, switching to a menstrual cup after a lifetime of using pads or tampons can take time. Aliza Abarbanel, Bon Appetit, "5 Ways a Menstrual Coach Could Help You Have Better Periods," 14 June 2018 Patches has a whole lifetime of memories to make with his new family. Peggy Calhoun, idahostatesman, "Meridian Pet of the Week: Patches," 5 June 2018 In her lifetime, Ginsburg has also defeated colorectal cancer in 1999 and, 10 years later, pancreatic cancer. Vogue, "Ruth Bader Ginsburg Undergoes Successful Surgery to Remove Cancerous Nodules From Her Lung," 21 Dec. 2018 Pause a moment and think what this could mean Or already has meant In our own lifetime. Constance Grady, Vox, "The Alice Walker anti-Semitism controversy, explained," 20 Dec. 2018 Lazard surveys energy buildouts that occurred in the previous year and divides the estimated cost of building and operating the plant, including fuel cost estimates, by the amount of energy a particular plant is expected to produce in its lifetime. Megan Geuss, Ars Technica, "New year, same story: Cost of wind and solar fall below cost of coal and gas," 12 Nov. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'lifetime.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of lifetime

Noun

13th century, in the meaning defined at sense 1a

Adjective

1834, in the meaning defined at sense 1

Keep scrolling for more

Learn More about lifetime

Statistics for lifetime

Last Updated

19 Jan 2019

Look-up Popularity

Time Traveler for lifetime

The first known use of lifetime was in the 13th century

See more words from the same century

Keep scrolling for more

More Definitions for lifetime

lifetime

noun

English Language Learners Definition of lifetime

: the time during which a person is alive

: a very long time

: the time during which something lasts or is useful

lifetime

noun
life·​time | \ ˈlīf-ˌtīm \

Kids Definition of lifetime

Keep scrolling for more

More from Merriam-Webster on lifetime

Rhyming Dictionary: Words that rhyme with lifetime

Thesaurus: All synonyms and antonyms for lifetime

Spanish Central: Translation of lifetime

Nglish: Translation of lifetime for Spanish Speakers

Britannica English: Translation of lifetime for Arabic Speakers

Comments on lifetime

What made you want to look up lifetime? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to gather or build up little by little

Get Word of the Day daily email!

Test Your Vocabulary

Homophone Quiz

  • three-bears-two-of-them-look-like-theyre-whispering-to-a-third-bear-who-looks-chuffed-to-be-the-center-of-attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!