mean life


Also found in: Dictionary, Medical, Financial, Acronyms, Wikipedia.

mean life

See half-life.

mean life

[′mēn ′līf]
(physics)
The average time during which a system, such as an atom, nucleus, or elementary particle, exists in a specified form; for a radionuclide or an excited state of an atom or nucleus, it is the reciprocal of the decay constant. Also known as average life; lifetime.
References in periodicals archive ?
There are certain cases where life should definitely mean life and if it doesn't mean life there would be people in this country who would rightly think the criminal justice system was not producing punishments which fit the crime,' he said.
Life should either mean life or a sentence of an average quarter of a life, which would be a minimum of 25 years.
According to Ministry of Justice figures, the prostitute killer's sentence today means there are now 36 living prisoners for whom life will mean life.
Surely life should mean life - it is no wonder killings and muggings continue when the criminal knows they are going to get such a short sentence.
But David Hines, founder of the North of England Victims' Association, told a conference yesterday that many families wanted life to mean life.
So when a life sentence is given it should mean life, or when they do get released after a visit to prison, let them live next door to the do-gooders.
The father of Craig Sweeney's victim said: "If ever there was a crime where life should mean life then this is it.
And now a rule that can mean life or death for those who must observe it has been made more strict, not on the basis of fact, but in an act of political pandering.
Child killer Hindley, aged 56, is challenging decisions by two Home Secretaries that, in her case, a life sentence must mean life.
Lorna, 32, wrote: "My brother Scott Blackwood suffered horrifically by these people and life should mean life.
Judges at the European Court of Human Rights last week ruled the terms were "inhuman and degrading" - meaning life does not mean life any more.