psi

¹

[ sahy, psahy ]

noun

, plural psis.

1. the 23rd letter of the Greek alphabet (Ψ, ψ).
2. the group of consonant sounds represented by this letter.

psi

²

[ sahy ]

noun

1. any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.

psi

³

or p.s.i.

1. pounds per square inch.

psi

¹

/ 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

psi

²

abbreviation for

1. pounds per square inch

Word History and Origins

Origin of psi¹

1350–1400; Middle English < Greek pseî

Origin of psi²

1940–45; shortening of psychic or parapsychic

Example Sentences

There are two sets of steps leading from the front doors of Phi Kappa Psi house.

From The Daily Beast

The bonds of Phi Kappa Psi brotherhood were too strong to break.

From The Daily Beast

The Charlottesville Police did indeed have jurisdiction over the Phi Kappa Psi house.

From The Daily Beast

I have not sued Phi Kappa Psi, the University of Virginia, or any of the individuals involved.

From The Daily Beast

Will PSI (private sector involvement) become common in future bailouts?

From The Daily Beast

Certainly it had protected him on Antar, and with equal certainty it must have been responsible for the psi powers he possessed.

From Project Gutenberg

We know the Auerbach cylinder will store a psi impulse, but we don't know how.

From Project Gutenberg

I didn't need any psi talent for that, it was an inevitable part of his pattern.

From Project Gutenberg

What we really lacked in psi was the ability to orient its phenomena.

From Project Gutenberg

I could say psi was a flow of positrons, and it would mean as much.

From Project Gutenberg