PSI

  1. (initialism) .  Pounds per square inch.
  2. (initialism) .  Pre-Sentence Investigation.
  3. (initialism) .  Protein Structure Initiative.
  4. (initialism) .  Pollutant Safety Index or Pollutant Standard Index (measurement of the air pollutant such as haze).
  5. (initialism) .  (Singapore) Please Stay Indoors.
  6. Noun.  (countable) The twenty-third letter of Classical and Modern Greek and the twenty-fourth letter of Old and Ancient Greek.
  7. Noun.  (uncountable, parapsychology) A form of psychic energy.
  8. (initialism) .  Pounds per square inch (qualifier, an imperial unit of pressure) .

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.