lifetime

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lifetime

1. 
a. the length of time a person or animal is alive
b. (as modifier): a lifetime supply
2. Physics the average time of existence of an unstable or reactive entity, such as a nucleus, excited state, elementary particle, etc.; mean life

Lifetime

 

in physics, the average duration τ of existence of (1) excited states of atoms and molecules, which end with the spontaneous transition of particles to a less excited or basic (unexcited) state; the lifetime is an important characteristic of the energy levels of particles (the lifetime on a level); (2) unstable (radioactive) atomic nuclei as well as elementary particles; their lifetime is linked with their half-life period T by the formula τ = T/In 2; and (3) quasiparticles (elementary excitations) in solids and in liquid helium, particularly electrons and holes in semiconductors.

lifetime

[′līf‚tīm]
(physics)
References in periodicals archive ?
For those of you who don't know us, my husband and I are both in our 30s (life-time homes?), are both disabled (general housing?) and my husband is a permanent wheelchair user.
'This is the opportunity of a life-time for me and Dean Ryan's ambition to make Gloucester the dominant force in club rugby is something I want to be part of.'
He already had a life-time ban from keeping pigs, dating back to the 1990s.
Cheney and Hosington note that Weston was "[w]idely celebrated throughout the Neo-Latin republic of letters as Virgo Angla, 'the English Maiden'" (xv) and saw two editions of her works published in her life-time. But the very thing that made her a writer of international renown in her own day--her decision to publish only in Latin--is largely what has hidden her from more recent students and scholars.
Residents pay a one-time premium to SureDeposit when they sign their new lease, which covers the life-time of their tenancy.
More insurers are using account or household profitability analysis and Life-Time Value analysis to make more informed decisions.
"In my own life-time I have seen how the labor movement lifted millions of working people into the middle class; how it won the minimum wage, the paid vacation, health coverage, and pension plans, and how it widened the circle of human dignity beyond skilled craft workers to ...
"So many of the Omagh patients will have life-time follow-up if not life- time treatment."
on termination of the trust during the current income beneficiary's life-time, all of the trusts assets were to be distributed to such beneficiary.
Looking back after a life-time of interaction with the Middle East, he feels that whatever he may have contributed there, he has learned a great deal from his Moslem and other friends and that his and Cherie's lives have been immeasurably enriched.
This is a popular option among older investors because it allows them to purchase an annuity (similar to a life insurance annuity) from a charity and receive a fixed growth annuity income for the rest of their life-time. For participants age 65 or older, the annuity starts immediately.
* The diagnosed need for life-time confinement to a long-term custodial care facility.