Dictionary![]() ![]() psiPronunciation: (sī, psī), [key] —n., —pl. psis. 1. the 23rd letter of the Greek alphabet (Ψ, ψ). 2. the group of consonant sounds represented by this letter. psiPronunciation: (sī), [key] —n. any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like. Cf. pseudoscience, parapsychology. psipounds per square inch. Also,p.s.i. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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