Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “lifespan”

See all translations


noun [C] uk   /ˈlaɪf.spæn/ us  
C2 the length of time for which a person, animal, or thing exists: The average human lifespan in the developed countries has increased over the last hundred years. The project's lifespan is estimated at about five years.
(Definition of lifespan from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of lifespan?
Add Cambridge dictionaries to your browser to your website

Definitions of “lifespan” in other dictionaries

Word of the Day


a young sheep, or the flesh of a young sheep eaten as meat

Word of the Day

The way we move (Verbs for walking and running)

by Kate Woodford,
March 25, 2015
​​​ This week we’re looking at interesting ways to describe the way that people move. Most of the verbs that we’ll be considering describe how fast or slow people move. Others describe the attitude or state of mind of the person walking or running. Some describe both. Starting with verbs for walking slowly,

Read More 

stackin’ p

March 30, 2015
idiom slang earning a lot of money ‘That’s a very generous present.”Yeah, well, she’s stackin’ p, innit?’

Read More