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Definitions
PSI Tweet Definition of PSI Like Definition of PSI on Facebook
initialism 
  1. Pounds per square inch.
  2. Pre-Sentence Investigation.
  3. Protein Structure Initiative.
  4. Pollutant Safety Index or Pollutant Standard Index (Measuement of the air pollutant such as haze)

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psi Tweet Definition of psi Like Definition of psi on Facebook
noun 
  1. (countable) The twenty-third letter of Classical Greek, Classical and Modern Greek and the twenty-fourth letter of Old Greek, Old and Ancient Greek.
  2. (uncountable) A form of psychic energy.
1993, "Come, lad," he said. "We will take tea together and speak of the noumenon, the and other more heterogenous phenomena." " Will Self, My Idea of Fun
  • Letter of the Greek alphabet: '''Ψ Ï
    Previous: chi, Χ
    Next: omega, Ω
Translations: 
  • French: psi
    1. French, psi
    2. Italian: psi
initialism 
  1. Pounds per square inch (an imperial unit of pressure)
Etymology: Greek , the name for the twenty-third letter of the alphabet (, ).


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