half life

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Noun1.half life - the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
References in periodicals archive ?
A half life makes you a stranger to intimates, and your intimates strangers
For example, if you put 10 tonnes of make-up water into your system, and every hour 1 tonne runs off as bleed water, this will determine the half life for your system.
Product type, decision making, historical data analysis, and information architecture are all involved when determining the cadence of tactical, strategic, or operational decisions in developing valuations from the half life of this data.
Elsewhere, there's a look at the classic shooter Half Life for PS2