psi1

[sahy, psahy] /saɪ, psaɪ/
noun, plural psis.
1.
the 23rd letter of the Greek alphabet (Ψ, ψ).
2.
the group of consonant sounds represented by this letter.
Origin
1350-1400; Middle English < Greek pseî

psi2

[sahy] /saɪ/
noun
1.
any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.
Compare pseudoscience, parapsychology.
Origin
1940-45; shortening of psychic or parapsychic

psi

1.
pounds per square inch.
Also, p.s.i.
Examples from the web for psi
  • While attending cornell university he was a brother of chi psi fraternity.
British Dictionary definitions for psi

psi1

abbreviation
1.
pounds per square inch

psi2

/psaɪ/
noun
1.
the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps
2.
  1. paranormal or psychic phenomena collectively
  2. (as modifier): psi powers
Word Origin and History for psi
n.

23rd letter of the Greek alphabet. Use for "psychic force, paranormal phenomenon" dates from 1942 (probably from psychic (adj.)).

psi in Medicine

psi 1 (sī, psī)
n.

Symbol ψ The 23rd letter of the Greek alphabet.

psi in Technology


Portable Scheme Interpreter

Related Abbreviations for psi

psi

pounds per square inch