Psi — meaning in English

English meaning

• psi noun The 23rd letter of the Greek alphabet (Ψ, ψ).

Senses

Psi is used for these senses in English:

• psi (countable) The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.

psi — full definition

1. noun The 23rd letter of the Greek alphabet (Ψ, ψ).
2. noun In parapsychology, a supposed form of psychic or mental energy behind ESP and similar phenomena.
3. symbol Abbreviation for "pounds per square inch," a unit of pressure.