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psi

/saɪ/
noun
  1. The 23rd letter of the Greek alphabet (Ψ, ψ).
    • The Greek letter psi is often used in mathematics and physics.
    • In fraternity names, psi is a common letter in the Greek alphabet.
    • She wrote a large psi on the whiteboard to represent the wave function.
  2. Parapsychological phenomena or psychic abilities, such as telepathy or clairvoyance.
    • Many people claim to have experienced psi, but scientists remain skeptical.
    • The conference focused on the latest experiments in psi research.
    • The study of psi includes research on extrasensory perception.
  3. Pounds per square inch, a unit of pressure.
    • The scuba tank was filled to 3000 psi.
    • The car tires should be inflated to 35 psi.
    • Check the psi on the air compressor before using it.