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

Just above 45 psi, I flipped the pump chuck off and spun the wheel on its axle, bracing for the aerosolized mist of sealant that might come from a gap in the bead seat.

From Outside Online

Blocks made of reishi mushrooms, for example, are strong enough to bear thousands of PSI.

From The Daily Beast

Lighthouse lab scores in PSI are “calibrated to be representative of your upper percentiles” for worst case scenarios, like that of underpowered browsers on sluggish networks.

From Search Engine Land

Lighthouse outside of PSI, in Dev Tools or packaged by NPM as an open Node project, can be calibrated to simulate various scenarios.

From Search Engine Land

They tend to have a PSI in the 2,000 to 3,000 range—sometimes more—and are ideal for more intense tasks like cleaning large decks and patios, the side of the house, boats, and utility vehicles.

From Popular-Science

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