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psi

Pronunciation: /psaɪ/

The English word “psi” has 2 meanings listed here.

noun

  1. The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
  2. A form of psychic energy.

Etymology

From Middle English psi, from Latin psī, from Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.