- pounds per square inch.
- the 23rd letter of the Greek alphabet (Ψ, ψ).
- the group of consonant sounds represented by this letter.
Origin of psi1
1350–1400; Middle English < Greek pseî
- any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.
Origin of psi2
1940–45; shortening of psychic or parapsychic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for psi
Will PSI (private sector involvement) become common in future bailouts?What Bailout? Six Reasons to Love Cyprus
March 18, 2013
In 2009, Judd lent her voice to a PSI World Malaria Day PSA.Ashley Judd’s Fiery Speeches on Favorite Political Causes (VIDEO)
December 6, 2012
The fraternities involved in the alleged drug sales were Alpha Epsilon Pi, Pi Kappa Alpha and Psi Upsilon.Columbia University Drug Bust
Joshua Robinson, Lloyd Grove
December 8, 2010
PSI board member Ashley Judd is a celebrated actress, activist, and humanitarian.
Take Action: Ashley Judd works with the nonprofit PSI, investing in the power of women to lift communities out of poverty.
We know the Auerbach cylinder will store a psi impulse, but we don't know how.
I didn't need any psi talent for that, it was an inevitable part of his pattern.
What we really lacked in psi was the ability to orient its phenomena.
I could say psi was a flow of positrons, and it would mean as much.
We were both trying to get hold of and benefit by psi effects, weren't we?
- pounds per square inch
- the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps
- paranormal or psychic phenomena collectively
- (as modifier)psi powers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for psi
23rd letter of the Greek alphabet. Use for "psychic force, paranormal phenomenon" dates from 1942 (probably from psychic (adj.)).
Online Etymology Dictionary, © 2010 Douglas Harper
- The 23rd letter of the Greek alphabet.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.