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WordReference Random House Unabridged Dictionary of American English © 2024psi1 (sī, psī),USA pronunciation n., pl. psis. - Linguisticsthe 23rd letter of the Greek alphabet (Ψ, ψ).
- Linguisticsthe group of consonant sounds represented by this letter.
- Greek pseî
- Middle English 1350–1400
- Psychology, Holistic Therapyany purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like. Cf. pseudoscience, parapsychology.
- shortening of psychic or parapsychic 1940–45
- Physicspounds per square inch.
Also, p.s.i. Collins Concise English Dictionary © HarperCollins Publishers:: psi abbreviation for - pounds per square inch
psi /psaɪ/ n - the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps
- paranormal or psychic phenomena collectively
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