Psi meaning

sī, psī, psē
Parapsychological phenomena or abilities considered as a group.
noun
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Pounds per square inch.
abbreviation
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(Singapore) Please Stay Indoors.
initialism
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Psi is the twenty third letter of the Greek alphabet.

An example of psi is Ψ.

noun
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Psi is the twenty third letter of the Greek alphabet.

An example of psi is the average human blood pressure of 2.32 psi/1.55 psi which equates to 120/80.

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The twenty-third letter of the Greek alphabet (Ψ, ψ)
noun
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Of or having to do with psychic or paranormal abilities or phenomena.
adjective
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Such abilities or phenomena collectively.
noun
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Pounds per square inch.
abbreviation
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Pollutant Standards Index.
abbreviation
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Pounds per square inch.
initialism
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Protein Structure Initiative.
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Pollutant Safety Index or Pollutant Standard Index (measurement of the air pollutant such as haze)
initialism
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The 23rd letter of the Greek alphabet.
noun
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Pre-Sentence Investigation.
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Origin of psi

  • Middle English from Late Greek from Greek psei

    From American Heritage Dictionary of the English Language, 5th Edition

  • Shortening and alteration of parapsychological

    From American Heritage Dictionary of the English Language, 5th Edition