Meaning & use
Psi
Last updated
The twenty-third letter of the Greek alphabet, also used as a unit abbreviation for pounds per square inch and as a term for paranormal mental abilities.
See it in a sentence
The Greek letter psi is often used in physics to denote a wave function.
The tire pressure gauge read 32 psi.
A note on using this word
Written as Greek psi in the alphabet; in physics it commonly denotes a wave function, while in everyday use 'psi' abbreviates 'pounds per square inch.'
Another way to use it
2. noun
Pounds per square inch, a unit of pressure.
The recommended tire pressure is 35 psi.
3. noun
Psychic or paranormal mental phenomena, such as telepathy.
The study claimed to test for psi abilities in volunteers.
Make it your own
Write a sentence using “Psi”, then compare your use with the examples above.
Your draft stays on this page and is not sent anywhere.