lifetime


Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Idioms, Wikipedia.

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 ?
At the close, Lifetime is expected to have a net debt / EBITDA ratio of less than 4.
Lifetime risk was estimated using an algorithm previously developed by Dr.
Daniels replied: ``I think it's our job at Lifetime to give women what they want.
One-time payments would be based on the veteran's life expectancy and would be a fraction of the current value of lifetime monthly payments.
John Hancock Life Protection UL G Lifetime 5,435 11,644
In a research note on the deal, Giblen points out that Lifetime is paying only 36 percent of revenues for Syratech, much lower than is usual for branded businesses.
Producer Robert Greenwald, who's supplied a number of Lifetime pictures (including the current six-hour "Beach Girls" with Rob Lowe), says: "Trevor knows exactly what Lifetime's female viewers are looking for in a movie.
As one can see, the lifetime obtained from this data is substantially shorter than the presently accepted value of the neutron lifetime (885.
Gottlieb of CB Richard Ellis (CBRE), which represented Lifetime.
Since each projected lifetime produces a unique set of future cash flows, the distribution of lifetimes translates into a distribution of present values of cash flows or settlement prices.
Lifetime transfers subject to gift tax are reported on Form 709, Schedule A, Computation of Taxable Gifts.
The lifetime of removable media is defined as the length of time that the media can be successfully written to, stored and successfully read.