from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A number less than or equal to any number in a set.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (mathematics) a number equal to or less than any other number in a given set


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  • "The figure quoted when oil companies declare their reserves is a 'P90' figure, which means an oil reserve has been discovered, the oil in it is recoverable, and the estimate has a 90 per cent chance of being exceeded. This is always on the conservative side. Another figure, the P50 estimate refers to 'proven but possible' oil reserves, and is rarely quoted. P50 can exceed P90 by a factor of two or three, and often reflects the output more accurately. So why don’t we hear P50, rather than P90?

    'P90 is a lower bound, and companies have a duty to report what the lower bound is to statutory bodies, such as the Securities and Exchange Commission, and BERR in the UK,' says Pike."

    - Andrew Orlowski, 'What the oil companies don't tell you', 17 Sep 2008.

    September 22, 2008