psi

n. Stands for pounds per square inch. You use this to measure how much air or liquid pressure is inside something, like a car tyre.

n. Abbreviation for pounds per square inch. A unit of pressure used primarily in American and British engineering contexts to measure the force exerted on a surface.

“You should check that your car tyres are filled to 32 psi before a long trip.”

“The industrial boiler is rated for a maximum operating pressure of 150 psi, beyond which the safety valves are designed to trigger automatically.”

Technical

n. the twenty-third letter of the Greek alphabet (Ψ, ψ).

n. The twenty-third letter of the Greek alphabet, often used in mathematics and physics to represent specific variables or functions.

“The professor wrote the Greek letter psi on the board to represent the wave function.”

“In quantum mechanics, the Greek letter psi is the standard symbol used to denote the state of a system within a wave equation.”

Technical

n. a word used to describe mysterious mental powers, like reading minds or moving objects with your brain.

n. A general term for parapsychological phenomena, including extrasensory perception and psychokinesis.

“The movie was about a girl who could use psi to move objects across the room.”

“Early researchers in parapsychology attempted to quantify psi through rigorous card-guessing experiments, though the results remained highly controversial in the scientific community.”

Technical